Question

a pigeon is flying towards north with speed 2ms^-1 and trying to cross the train moving towards south of length 100m if speed of train is 23ms^-1 then pigeon will cross the length of train in how many second

Answer 1

we know that time is = distance/speed:
here,
distance=length of train =100th
and speed= related speed = speed of train + speed of bird =(23+2)m/s= 25m/s

now time = distance/speed = 100/25= 4s

TIME = 4seconds