Two boys are standing 250 m away from each other on their bikes. They start to travel towards each other and cross after 10 sec. If the first boy is travelling at a speed of 30 kmph then find the speed of the second boy.
Correct Answer : d ) 55 kmphExplanation :
Let the speed of the second boy be x kmph.
Total distance needed to be travelled to cross each other = 250 m
Time taken by boys to cross each other = 10 sec
Since, boys are travelling towards each other.
Thus, the relative speed of boys = (30 + x) kmph
Converting relative speed in kmph
Relative speed = 90 kmph
(30 + x) kmph = 90 kmph
So, x = 60 kmph
Thus, the speed of the second boy = 60 kmph
Hence, (e) is the correct answer.