Practice Test Discussion

A man drives to his office at 60 km/hr and returns home along the same route at 30 km/hr. Find the average speed?

87 km/hr

45.6 km/hr

40 km/hr

77 km/hr

None of these

Explanation

According to the question,

A=60, B=30

we know the formula,

Average speed= $\frac{2 AB}{A+B}$

The average speed = $\frac{2 \times 60 \times 30}{60 + 30}$ = $\frac{3600}{90}$

= 40 km/hr

Hence, Option C is correct.

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