Question 533160
the combined speed of both trains =45+36= 81 kph

time taken by second train  to pass the first train completely is 6 second

6/3600 = 1/600 hours

Distance = speed * time

speed = 81 kph
time = 1/600 hour

d= (81*1/600 )
d= 0.135 km
d= 0.135 *1000 = 135 meters