The total distance travelled by the train equals 240+300 = 540 metres.
This distance is covered by the train in 27 seconds. Hence, the speed of the train equals $$frac{540}{27} = 20$$ m/s
This speed when converted to kmph equals $$20 * frac{18}{5} = 72$$ kmph As this is not given in the options, the correct answer is option (e)