Question

Time taken by a train of length 1 km in crossing a
bridge of length of 2 km, moving at a speed of
1 kr/minute, will be
(1) 1 minute
(2) 2 minute
(3) 3 minute
(4) 4 minute​

Answer 1

Answer:

2 minute

Explanation:

Because the train is of 1 km and bridge is of 2 km i.e. double of train .

So,in easy way think, if train is traveling 1km/m then it could cover 2 km in 2 minutes only.

Hope it helpful for you......

Answer 2

The correct answer is option (4) 4 minute.

GIVEN

Length of the train = 1 km

Length of the bridge = 2km

Speed of the train = 1km/min

TO FIND

Time taken by the train to cross the bridge

SOLUTION

We can simply solve the above problem as follows;

It is given ,

Length of the train = 1 km

Length of the bridge = 2km

In order to cross the bridge, The train will cover a distance = Length of the train will entering the bridge + Length of the bridge + Length of the train exiting the bridge

Total distance = 1 km + 2km + 1km = 4 km

To calculate the time we will apply the following formula,

Time = Distance/Speed

= 4/1

= 4 minutes

Hence, The correct answer is option (4) 4 minute.

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