Question 137

One-fourth of a certain journey was covered at an average speed of 45 km/hour, one third at the speed of 48 km/hour and the remaining journey at the speed of 50 km/hour. The average speed of the whole journey in km/hour is:

Solution

Let the total distance be 1200 kms

Time taken for first one fourth = 300/ 45 = 20/3 = 6.67

Next one third time = 400/ 48 = 25/3 = 8.33

Remaining = 500/50 = 10

Average speed = total distance / total time = 1200/25 = 48 kmph

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