Question 66

Two bikers A and B started for a race of 120 km with a constant speed of 30 kmph and 40 kmph respectively. After 2 hours A raised his speed and both reached the finish line at same time What was the speed of A after 2 hours of starting the race ?

Solution

Let A's new speed be x kmph after 2 hours. Total time taken by B = 120/ 40 = 3 hours.

Total distance travelled by A in 2 hours = 30 x 2 = 60 kms

So,

A should travel 60 kms in the last one hour. He can do that if he travels at 60 kmph.

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