Question

A train moves past a pole and a platform 264 metre long in 8 seconds and 20 seconds respectively. What is the speed of the train

Answer 1

Answer:

79.2 km/hr

Explanation:

Length of the Bridge = 264 m.

Time taken to pass the bridge = 20 sec.

Time taken to passe the post = 8 sec.

Length of the train = X m (Let.)

To pass the bridge train need to cover Train's length + Bridge legnth  (X +264).

Speed = Distance covered / time taken

Now,

X/8 = (264 + X)/20

20X = 264 *8 + 8X

20X - X = 264 *8

12X = 264 *8

X = (264 *8)/12

X = 176 m.

Speed of the train = 176/8 = 22 m/sec = (22*18)/5 = 79.2 Kmph.

Answer 2

Explanation:

Hey dude

Distance = 264m

Time = 8sec

Speed = distance /time

=264/8

=33

Again if he completes in 20s

Then speed = 264/20

=13.2

Therefore final speed = 33+13.2

=46.2