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Learn POLICE SI MCQs with answers [Page 14 of Department 105]

R

Rohan Raj • 6.53K Points
Tutor III Math

131) A alone can do a piece of work in 3 days, while B alone can do the same work in 2 days. If they work together to complete the work, their total wages is fixed ₹ 225. Find the share of A.

  • (A) ₹ 90
  • (B) ₹ 75
  • (C) ₹ 95
  • (D) ₹ 65
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Correct Answer - Option (A)

No Explanation found. Add Explanation and get +2 points.

R

Rohan Raj • 6.53K Points
Tutor III Math

132) P, Q and R enter into a contract for a piece of the work for ₹ 1100. P and Q together are supposed to do 7/22 of the work. How much does R get?

  • (A) ₹ 750
  • (B) ₹ 350
  • (C) ₹ 4751
  • (D) ₹ 900
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Correct Answer - Option (A)

Explanation :

Work done by (P + Q) = 7/22
Work done by R = 1 - (7/ 22) = (22-7)/22 = 15/22
∴ (P + Q)'s share : R's share = (7/22) : (15/22) = 7 : 15
R's share = (15/22) x 1100 = 15 x 50 = ₹ 750

R

Rohan Raj • 6.53K Points
Tutor III Math

133) A can complete a piece of work in 10 days, while B alone can complete it in 15 days. They work together for 5 days and rest of the work is done by C in 2 days. If they receive $ 450 for the whole work, how should they divide the money?

  • (A) $250, $100, $100
  • (B) $225, $150, $75
  • (C) $200, $150, $100
  • (D) $175, $175, $100
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Correct Answer - Option (B)

No Explanation found. Add Explanation and get +2 points.

R

Rohan Raj • 6.53K Points
Tutor III Math

134) Two men, A and B, working together, completed a piece of work. If worked individually, it would have taken them 30 and 40 days to complete the work. If they have received a payment of $2100, then B’s share is:

  • (A) $900
  • (B) $1200
  • (C) $800
  • (D) $1300
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Correct Answer - Option (A)

No Explanation found. Add Explanation and get +2 points.

R

Rohan Raj • 6.53K Points
Tutor III Math

135) A can do a piece of work in 8 days. A undertook to it for $320. With the help of B, he finishes the work in 6 days. B’s share is:

  • (A) $80
  • (B) $240
  • (C) $100
  • (D) $120
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Correct Answer - Option (A)

No Explanation found. Add Explanation and get +2 points.

R

Rohan Raj • 6.53K Points
Tutor III Math

136) If 6 persons working 8 hours a day earn $8400 per week, then 9 persons working 6 hours a day will earn per week:

  • (A) $8400
  • (B) $16800
  • (C) $9450
  • (D) $16200
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Correct Answer - Option (C)

No Explanation found. Add Explanation and get +2 points.

R

Rohan Raj • 6.53K Points
Tutor III Math

137) A and B are 20 km apart. A can walk at an average speed of 4 km/hr and B at 6 km/h. If they start walking towards each other at 7:000 am, when they will meet?

  • (A) 8:00 am
  • (B) 8:30 am
  • (C) 9:00 am
  • (D) 10:00 am
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Correct Answer - Option (C)

Explanation :

Suppose they will meet after T hours.
Distance = Speed x Time
Sum of distance traveled by them after T hours
6T + 4T = 20 km
T = 2 hours.
So they will meet at 7:00 AM + 2 hours = 9:00 AM

R

Rohan Raj • 6.53K Points
Tutor III Math

138) Arjun runs a distance of 1500 m in 5 minutes. What is his speed in Km/hr ?

  • (A) 16 km/hr
  • (B) 18 km/hr
  • (C) 15 km/hr
  • (D) 20 km/hr
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Correct Answer - Option (B)

Explanation :

Speed = (1500/300 ) m/sec
= 5 m/sec
= (5 x 18/5 ) km/hr
= 18 km/hr

R

Rohan Raj • 6.53K Points
Tutor III Math

139) In how many minutes will Rohit cover a distance of 800 m, if he runs at speed of 10 km/hr?

  • (A) 5 min 12 sec
  • (B) 4 min 40 sec
  • (C) 5 min
  • (D) 4 min 48 sec
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Correct Answer - Option (D)

Explanation :

Rohit's speed = 10 Km/hr = (10 x 5/18) m/sec = 50/18 m/sec

Time taken to cover 800 m = (800 / (50/18) ) sec
= (800 x 18/50) sec = 288 sec = 4 min 48 sec

R

Rohan Raj • 6.53K Points
Tutor III Math

140) A plane flies along the four sides of a square field at a speed of 200, 400, 600 and 800 km/hr. Then find the average speed of plane around the square field.

  • (A) 394
  • (B) 400
  • (C) 414
  • (D) 384
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Correct Answer - Option (D)

Explanation :

Let the side of the square field be x and the average speed of plane be y

x/200 + x/400 + x/600 + x/800 = 4x/y
⇒ 25x/2400 = 4x/y
⇒ y =384

∴ Average speed is 384 km/hr

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