Question

a train 210 M long took 12 seconds to pass A 90 M long tunnel find the speed of the train..

plz find it using direct variation..not with the formula..

Answer 1

Find the distance traveled in the 1 second:

12 seconds = (90 + 210) m

12 seconds = 300 m

1 second = 300 ÷ 12 = 25 m

Find the distance traveled in the 1 hour:

1 second = 25 m

1 min = 25 x 60 = 1500 m

1 hour = 1500 x 60 = 90,000m

Convert m to km:

1 hour = 90 km

⇒ Speed = 90km/h

Answer: The speed is 90km/h