Question

A distance between two places is 120km .A car travelling at a certain speed can cover the distance in 2hours 30min. By how many km/h should the speed of the car be increased for it to take 30 minutes less to cover the distance? full explanation ​

Answer 1

Answer:

12 km/h

Step-by-step explanation

speed = distance/time

we know distance and time = 120 km and 2hr 30 min this can be written as 2.5 hrs.

average speed = 120/2.5 = 48 km

now 2hr30min - 30 = 2hrs

so 120/2 = 60 km/h = 60 - 48

= 12 km/h