Time and Distance Practice Test 2 with solutions

Question : 16 of 40

Marks: +1, -0

A car travels first one-third of a certain distance with a speed of 10 km/hr, the next one-third distance with a speed of 20 km/hr and last one-third distance with a speed of 60 km/hr. What is the average speed of the car for the whole journey?

36 km/hr
30 km/hr
24 km/hr
18 km/hr

Validate

Solution:

Let distance of whole journey be x km; then
Required average speed =

x/{x/{3×10}+x/{3×20}+x/{3×60}}

{3×10×3}/{5}

= 18 km/hr

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