NIFT UG 2020 Question Paper with solutions

Question : 26 of 150

Marks: +1, -0

A car covers four successive

7 {km}

distances at speeds of 10km/h, 20km/h, 30km/h, 60 km/h respectively. Its average speed over this distance is

Solution:

Total distance travelled

=28 {km}

∴

Average speed

=\;{28}/{{7}/{10}+\;{7}/{20}+\;{7}/{30}+\;{7}/{60}}

=\;{28 × 60}/{42+21+14+7}=\;{28 × 60}/{84}=20 {km} {/} {h}

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