How Long Time will be Taken?

A car reached Raipur from Sonagarh in 35 min with an average speed of 69 km/h. If the average speed is increase by 36 km/h, how long will it take to cover the same distance?

  1. 24 min
  2.  27 min
  3.  23 min
  4.  29 min
Anurag Mishra Professor Asked on 31st July 2015 in Maths.
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1 Answer(s)
Best answer

Answer: (3) 23 min
Explanation:-
The average speed of the car = 69 km/hr
Time taken by car to reached Raipur from Sonagharh = 35 min = 35/60
= 7/12 hr.
The distance from Raipur to Sonaghrh = 69 x 7/12
= 40.25 km
If the average speed increased by 36 km/hr.
Then, the speed = 69 + 36
= 105 km/hr
Time taken by car to cover 40.25 km = 40.25/105
= 8.05/21
= 8.05 /0,383
= 0.3833 hr
1 hr = 60 min
Therefore, 0.3833 hr = 0.3833 x 60
= 23 min
Hence, the answer is (3) 23 min.

Anurag Mishra Professor Answered on 31st July 2015.
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