Question

a train 450m long, crosses apple in 45/2 what is the speed of the train in km/h a,70 b,72 c,69 d,60​

Answer 1

Answer:

69 is the answer

Step-by-step explanation:

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Answer 2

450m ÷ 22.5 s = 20m per s

Speed = 20 m/s

1000m = 1km

60s = 1 minute(min)

60min = 1 hour (h)

1 h = 3600s

Solution:

Speed = 20 m /s:

20 m × 3600s = 72000 m

1s × 3600s = 3600 s

Speed = 72000 m/3600s

Since 1km = 1000m, we have to

72000÷1000= 72km

3600s= 1h

Speed = km/h

Answer : 72

Speed = 72km/h