Time and Distance Practice Test 2 with solutions

Question : 28 of 40

Marks: +1, -0

A car covers four consecutive extensions of 3 km each at the speeds of 10 km/hr, 20 km/hr, 30 km/hr and 60 km/hr. Its average speed of journey is:

Solution:

Total distance of the journey = 4 × 3 km = 12 km
Total time taken =

3/{10}+3/{20}+3/{30} + 3/{60}

{36}/{60}

3/5

hr.
Hence, average speed =

{12}/{3/5}

{12×5}/3

= 20 km/hr.

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