Question

If a car runs at 45km/hour it reaches its destination late by 10 minutes but if runs at 60km/hour it is late by 4 minutes what is correct time for journey

Answer 1

the car runs correct jorney by18 minutes

Answer 2

Answer: 24 minutes

Explanation:

Given,

A car runs at 45km/hr it reaches its destination late by 10 min but if runs at 60km/hr it is late by 4min

To Find,

The correct time of the journey.

Solution,

For car A

Speed = 45 km/hr

Time = 10 min = 10/60 = 1/6 hr

For car B

Speed = 60 km/hr

Time = 4/60 = 1/15 hr

Let us assume that the correct time is t hrs.

So,

For car A

Distance = speed *time = 45(t+1/6)

For car B

Distance = speed*time = 60(t+1/15)

Now, equating the distances as it will remain the same in both cases.

45( t + 1/6) = 60 ( t + 1/15)

45t + 7.2 = 60t + 3.6

45t - 60t = 7.2 - 3.6

15t = 3.6

t = 24 min

Hence, the correct time for the journey is 24 minutes.