Question

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Answer 1

Answer:

L. C. M of 36 and 24=72

So they will cross each other in 72 hrs

I hope it is correct

Answer 2

Given,

S(1)=150m

S(2)=180m

v(1)=30 km/hr

v(2)=24 km/hr

Total Distance=150m +180m =330m

The relative velocity of trains w.r.t. each other=30+24=54 km/hr=(54×5/18) m/s=15 m/s

v=S/t

t=S/v=330/15=22s