How much Speed must be Increase by the Car

A car can finish a certain journey in 10 hours at the speed of  56 km/hr, In order to cover the same  distance in  7 hours, the speed of the car must be increases by

  1. 12 km/hr
  2. 16 km/hr
  3. 24 km/hr
  4. 18 km/hr
Monis Rasool Professor Asked on 26th May 2015 in Maths.
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1 Answer(s)

Answer: (b) 16 km/hr
Explanation:-
A car can finish a
journey  = 10 hrs
Speed of the car = 56 km/hr
therefore distance of the journey  = 10 x 56 = 560 km
Other car finish a journey = 7 hr
then, the speed of the car = 560/7 = 80 km/hr.

Increased speed = 80 – 56 = 16 km/hr
Hence, the speed of the car must be increased by 16 km/hr.

Anurag Mishra Professor Answered on 28th May 2015.
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