Question

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

Answer 1

Answer:

Distance = Rate x Time

From the question we know distance and time.

2:30 = 2.5 hours

D / T = R; therefore; 120 / 2.5 = original rate (speed) = OR

…30 minutes less than 2:30 = 2:00 hours = 2.0 hours

Also from the question we know distance and “new time”

Rate (speed) = Distance / Time

120 / 2.0 = new rate = NR

NR - OR = increase in speed required = your answer in kph

You can do the math.

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