If train, 75% of its usual speed, crosses the platform which is in the length of 450 m, in 18 seconds
and train crosses the pole with its usual speed in 12 sec. What is the time taken by the train to
cross tunnel which is in the length of 500 m at a speed of 18 kmph?
14 minutes 10 seconds
13 minutes 40 seconds
20 minutes 20 seconds
12 minutes 30 seconds
None of these