Practice Test Discussion

Abdul covers first half of his total journey with a speed of 25 km/hr and the next half with a speed of 40 km/hr. Find out the average speed of Abdul during complete journey?

$30 \frac{10}{13} km / hr$

$4 \frac{10}{13} km / hr$

$8 \frac{10}{13} km / hr$

$6 \frac{10}{13} km / hr$

None of these

Explanation

Given,

A=25 km/h, B=40 km/h

∴ Average speed= $\frac{2 AB}{A + B}$ = $\frac{2 \times 25 \times 40}{25 + 40}$

= $\frac{2 \times 5 \times 40}{13}$

= $\frac{400}{13} = 30 \frac{10}{13} km / h$

Hence, Option A is correct.

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