Question

The distance between two persons is 117 km. They start travelling towards each other at speeds 6km/hr and 3km/hr respectively. When will they meet?

Answer 1

Let,

time=x

Distance travelled by A in x hr=6x

Distance travelled by B in x hr=3x

6x+3x=117

9x=117

x=117/9

x=13 hr

Or

by using relative speed.

Think one person is still and the other person is travelling with a speed of the sum of their speed.

Speed=9km/hr

time=x

distance=9x=117

9x=117

x=117/9

x=13 hr

After 13 hrs they will meet

Hope it helps........

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