the distance between 2 places is 130 km. a car travelling at a certain speed can cover the distance in 1 hour 15 mins. by how many km/hr should be the speed of the car be increased for it to take 10 mins less to cover the distance?
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Answer:
16km/hr
Step-by-step explanation:
We know that speed = distance/time
Time = 1hr 15min = 5/4 hr
Original speed = 130/ [5/4]
= 104 km/hr
Now speed of car should be increased such that it takes only 65min.
65min = 1hr 5min = 13/12 hr
Required speed = 130/ [13/12]
= 120 km/hr
So speed should be increased by 16km/hr
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