77. Two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speeds is:

✅ The correct answer is option B.
Let the speeds of the two trains be x m/sec and y m/sec respectively.
Then, length of the first train = 27x metres,
and length of the second train = 17y metres.

27x + 17y
= 23

x+ y

27x + 17y = 23x + 23y
4x = 6y

x
=
3
.

y
2