Question

When there os a decrease of 10km/h in the speed of a train, it takes 4 and half hours more to cover 900 km.We need to find the usual speed of the train.

Answer 1

Answer: 50 km / hr

Step by step explanation:

Let the original speed be x km/hr

decreased speed be(x-10)km/hr

time= 9/2hrs

ACC to question

900/x - 900/(x-10) = 9/ 2

x= 50 km/hr ( original speed )