A train travels 500 m in first minute. In the next 4 minutes,

A train travels 500 m in first minute. In the next 4 minutes, it travels in each minute 125 m more than that in the previous minute. The average speed per hour of the train during those 5 minutes will be

Total distance covered by train in 5 minutes
= (500 + 625 + 750 + 875 + 1000) metre = 3750 metre
= 3.75 km.

Time = 5 minutes =	5	hour
	60

=	1	hour
	12

Speed of train =	Distance
	Time

=		3.75		kmph
		(1/12)

= (3.75 × 12) kmph
= 45 kmph