A train, 300m long, passed a man, walking along the line in the same direction at the rate of 3 kmph in 33 seconds. The speed of the train is:

Explanation:-

Let the speed of the train be x km per hour.
Man is walking in same direction, so,
Relative speed becomes = (x-3) km/h.
In 33 secs train travels its own distance i.e. 300m.
Speed of train = ^{300 * 18}/_{33 * 5} km/hour;
Or, x-3 = 32.72 km/h;
Or, x = (32.72)+3
Or, x= 35.72 km/h.