Question

9. Two boys start running from a certain place. One of them leaves the other 5 metres
behind in running 330 metres. How much apart will they be in going 15Km. 840 metres?
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Answer 1

Answer:

Let A and B are two bodies start moving each other . speed of body A is 5m/sec and speed of body B is 7m/sec .

Let at point C , they meet each other and t is meeting time .

A===========C =============B

we know ,

distance = speed × time

distance covered by A = 5 × t = 5t m

distance covered by B = 7 × t = 7t m

for they meet each other condition is

distance covered by A + distance covered by B = intial distance between A and B

5t + 7t = 120 m

12t = 120 m

t = 10 sec

hence, bodies meet each other at t = 10s

distance covered by A = 5t = 5×10 = 50m distance covered by B =7t =7×10 = 70m

hence, 50m distance from 1st point they meet each other.