Question

A train crosses a bridge 100 m long in 45 seconds at a speed of 60 km/h
Find the time taken by the train to cross a clock tower.​ ​

Answer 1

Explanation:

Given:

• Length of bridge = 100 m
• Crosses in bridge in time = 45 sec
• Speed of train = 60 km/h
• Let the length of train be x

To Find:

The time taken by the train to cross a clock tower.

Solution:

A/Q,

Total distance = Length of train + Length of bridge = 100 + x

Covert km/h into m/sec.

=> 60 × 5/18 m/s = 50/3 m/s

Now,

We know that,

• Speed = distance/time

=> 50/3 = 100+x/45

=> 50 = 100+x/15

=> 50 × 15 = 100 + x

=> 750 = 100x

=> x = 650.

Therefore,

Length of the train is 650m.

Now,

We know that,

• Speed = Distance/time

=> 50/3 = 650/x

=> 1/3 = 13/x

=> x = 39

Therefore,

Time taken by the train to cross a clock tower is 39 sec.

Answer 2

Answer:

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