Question

2 trains each traveling with a speed of 37.5km/h is aapproaching each other on the same straight track.a bird that can fly 60km/h flies off from one train when they are 90km and head directly from the other train .on approaching other train it flies back to the first and so on.total distance covered by bird is?

Answer 1

$t=\frac s{2v_0}=1.2~h,$

$s_1=v_1t=72~km.$