Question

a train takes 3 hours to reach the destination by travelling at the speed of 90 km per hour how long will it take the train when it travels at the speed of 120 km per hour?

( hint - answer is 2 hours 25 min )

give the answer in explanation step by step and solve by inversible variation step​

Answer 1

Answer:

4 hours

at speed of 120 km/h therefore, 90 : 3 :: 120:x.

let the time be x to travel x = 120 * 3 / 90 = 4 hrs

now, 90/3 = 120/x. here, 90x = 120 * 3.