Question

A train 350 metres long crosses an electric pole in 28 seconds. Find the speed of
the train in km/hr.
7.
A train 150 m long is running at 72 km/hr. It crosses a bridge in 13 seconds. Find
the length of the bridge.
How long will a train, 120 m long, take to clear a platform, 130 m long, if its
speed is 50 km/hr?
A tra
9.
A train 210 m long took 12 seconds to pass a 90 m long tunnel. Find the speed of
the train.
10. A train 270 m long is running at 80 km/hr. How much time will it take to cross a
platform 130 m long?
plz answer as fast as possible​

Answer 1

$answer$

1-Distance=350m

time=28s

speed= 350/28= 25/2

25/2×18/5=45km/h

2- see answer in the attachment

3-Length of train = 210 m.

Length of tunnel = 90 m.

Therefore, total distance = 210 + 90 = 300 m.

Time taken = 12 s.

Therefore, v = s/t

                    = 300/12.

                    = 25 m/s.

                    = 25 X 3600/1000

                    = 90 km/h.

Therefore, the speed of train is 90 km/h

4-Speed of the train = 80 km/hr = 80 x 1000/3600 80 x 5/18 = 200/9 m/sec

Distance = length of the trian + length of the platform = 130 m + 270 m = 400 m

Time = Distance / Speed

= 400x9 / 200

= 2 x 9

= 18 sec.

here is the correct answer please mark me brainliest and give thanks