To reach point B from point A at 4pm Sara will have to travel at an average speed of 18 kmph She wil...........

Quantitative Aptitude ( CCS) Time & distance

To reach point B from point A at 4pm, Sara will have to travel at an average speed of 18 kmph. She will reach point B at 3 pm if she travels at an average speed of 24 kmph. At what average speed should Sara travel to reach point B at 2 pm ?

36 kmph

28 kmph

25 kmph

30 kmph

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Explanation:

Difference of time = 1 hour
Distance = AB = x km
According to the question,
x/18 – x/24 = 1
= (4x – 3x)/72 = 1
= x = 72 km
Time taken at 18 kmph
= 72/18 = 4 hours
∴ Speed to cover 72 km in 2 hours
= 72/2 = 36 kmph