Question

two trians having length 120 metres are 100
metres are running in opposite direction with velocity of 40 kilometre per hour and 50 kilometre per hour in what time and they will complete process across each other​

Answer 1

Total length of both trains =120+100=220m

As the trains are moving in opposite direction their velocity adds up so, their resultant velocity=40+50=90kmph

90kmph=90x1000/(60x60) m/sec

=25m/sec

time taken to cross each other

is. =distance

velocity

so, Time=220/25

=44/5=8.8 sec