Question

TWO TRAINS 121m AND 99m IN LENGTH ARE RUNNING IN OPPOSITE DIRECTION WITH VELOCITIES 40km/hr and 32km/hr. IN WHAT TIME THEY WILL COMPLETELY CROSS EACH OTHER?

Answer 1

when running in opposite direction, net velocity adds up.
v = 40 +32 = 72 km/h = 72×(5/18) = 20 m/s
total distance = 121 +99 = 220 m
time = distance/speed = 220/20 = 11 sec

Answer 2

__________t = 11 sec___________

=================================

=================================

____Answer is in Attachment !!______

=================================
=================================

Hope it helps...

==============
=================================