M

Madan • 7.44K Points
Tutor III Math 

Q. A man, on tour travel first 160 km, at 64 km/hr. and the next 160km at 80km/hr. the average speed for the first 320 km. of the tour is ?

  • (A) 35.55km/hr.
  • (B) 71.11km/hr.
  • (C) 36km/hr.
  • (D) 72km/hr.
Correct Answer - Option(B)
Explanation by: Madan 
Average speed = 2t1 x t2/( t1 + t2)
= (2x64x80)/(64+80)km
= (2 x 64 x 80 ) / 144 km/hr.
=71.11km/hr.

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