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Question

A car moves for half of its time at $$ 80km/h $$ and for rest of time at$$ 40km/h$$. Total distance covered is $$ 60 km.$$ What is the average speed of the car


A
60km/h
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B
80km/h
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C
120km/h
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D
180km/h
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Solution

The correct option is A $$ 60 km/h$$
Let total times bed=$$ t \quad hr$$
so distance covered $$ 1^{st}$$ half=$$ 80 \times \frac{y}{2}$$
=$$ 40t$$
distance covered in $$ 2^{nd}$$ half = $$ 40\times \frac{t}{2}$$
=$$ 20t$$
A.V. speed=$$\frac{Total \quad distance}{total \quad time}$$
=$$ \frac{40 t + 20t}{t}$$
=$$ \frac{60t}{t} $$
=$$ 60 km/h$$

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