A race has three parts The speed and time required to complete the individual parts for a runner is ...........

Quantitative Aptitude (CDS) Time & distance

A race has three parts. The speed and time required to complete the individual parts for a runner is displayed on the following chart:

What is the average speed of this runner?

8.17 kmph

8.00 kmph

7.80 kmph

7.77 kmph

$Average\: speed=Total\: Distance\: / Total\: Time = \frac{(9*50+8*80+7.5*100) \frac{1}{60}}{ (50+80+100)\frac{1}{60}}$

= (45+64+75)/23 = 184/23
= 8 kmph

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