Question

A train 125m long passes a man, running at 50km/hr in the same direction in which the train is going, in 10 secs. The speed of the train is-​

Answer 1

Answer:

A train 125 m 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 ? Explanation: Speed of the train relative to man = (125/10) m/sec = (25/2) m/sec.

Answer 2

Answer:

50 kmph

Step-by-step explanation:

the train and the man is moving in same direction. So the relative speed = (speed of train-speed of man). Consider the train speed as x.

we know that,

Distance/Speed=Time

Length of train=125m

Speed of man=5 km/hr=5*5/18=25/18 m/s.

time=10s

now,

125/(x-25/18)=10

125*18=(18x-25)10

2250=180x-250

2500=180x

x=250/18

the ans is in km/hr. To convert m/s -> km/hr multiply the ans by 18/5

Therefore, (250/18)*(18/5)= 50 km/hr

Ans option B.

Hope you understand.please mari as brilliant