Question

A train 125m long passes a man, running at 5 km/hr in the same direction in which the train is
going, in 10 seconds. The speed of the train is:
15 km/hr​

Answer 1

Step-by-step explanation:

speed of the train relative to man =(x+5)kmph

=(x+5)*5/18 m/sec

125/(x+5)*5/18 =10

(125*18)/(x+5)*5 =10

(5*18)/(x+5)=10

90/(x+5) =10

90=10x+50

10x=90-50

10x=40

x=40/10

x=4

the speed of the train is 4kmph