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
B
80km/h
C
120km/h
D
180km/h

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=$$\frac{Total \quad distance}{total \quad time}$$=$$\frac{40 t + 20t}{t}$$=$$\frac{60t}{t}$$=$$60 km/h$$General Knowledge

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