150 mt long train crosses a signal post in 7 sec What is the speed of the train in Kmph?

Question

time and distence

Answer 1

Let's convert those numbers into kilometers and hours first, since you want to find kilometers per hour.

 

150 m × 1 km/1000 m = 150/1000 km = 3/20 km

7 sec × 1 min/60 sec × 1 hr/60 min = 7/(60×60) hr = 7/3600 hr

 

 

To get kilometers per hour, you should divide kilometers by hours. The train is moving at:

 

(3/20) ÷ (7/3600) = (3/20) × (3600/7) = (3×3600)/(20×7) = (3×180)/(7) = 540/7 ≈ 77.14 km/hr