There are two friends A and B. A starts with his car at the speed 40 kmph. B starts one hour later from the same place, in the same direction on his bike at the speed of 50 kmph. After how many hours will they meet ?
Answers
A) 12 h
B) 6 h
C) 4 h
D) 11 h
E) 9 h
Friend A starts first , he covers the distance = 40 kmph x 1hr = 40 km   The second friend B started after 1 hour.   Relative Speed = 50 kmph - 40 kmph = 10 kmph   so, they will meet in = 40/10= 
<gadget id="calculator">40/10</gadget>
<output>4</output>
4 hour.   ANSWER:4 h
<result>C</result>
There are two friends A and B. A starts with his car at the speed 40 kmph. B starts one hour later from the same place, in the same direction on his bike at the speed of 50 kmph. After how many hours will they meet ?