1.

The ratio of the speeds of a train and a man is 6:1. The length of the train is 650 mand crosses a pole in 1 minute 5 seconds. In how much time will the man cross the240m long platform?​

Answer»

Answer:

2.5 mins or 2 min 30s

Step-by-step explanation:

Ratio of velocity of train and man = 6:1

Length of train(L) = 650m

Length of platform(L’) = 240m

time taken by train to cross a pole (which we are CONSIDERING to be of negligible length ) = 1 min 5 SEC or 65 s

In other words, the train travels its length in 65s

[As, by the formula v=(L+L’/t) here L’ = 0; so v = L/t]

speed of train = 650/65 = 10m/s

Now man’s speed is simply 1/6 of train velocity, as indicated by the ratio,

so speed of man = 10/6 = 1.6m/s

So, time taken by the man to cross 240 m platform at CONSTANT speed

then time is 240/1.6 m/s

= 150 s = 2.5 mins or 2 min 30 s


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