Question

A train passes two bridges of length 800m abd 400m in 100 abd 60 seconds respectivly.The length of the train

Answer 1

Answer:

200 m

Step-by-step explanation:

Let v be the speed of train and l be the length of train.

to cross a bridge the train has to cover its length + length of bridge.

for first bridge,

speed of train (v) = l + 800/100

for second bridge,

speed of train (v) = l + 400/60

Since speed of train is same

l+800/100 = l+400/60

60(l+800) = 100(l+400)

60l + 48000 = 100l + 40000

40l = 8000

l = 200 m.

Length of train = 200 m