A car moves for half of the total time of travel at 80 km/h and for rest half of the time at 40 km/h.

If the total distance covered is 60 km, what is the average speed of the car?

60 km/h

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80 km/h

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120 km/h

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180 km/h

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Solution

The correct option is A
60 km/h

Time average speed = $\frac{v_{1} \frac{t}{2} + v_{2} \frac{t}{2}}{t}$

= $\frac{v_{1} + v_{2}}{2}$

= $\frac{80 + 40}{2}$

= $60$ km/hr.

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A car moves for half of the total time of travel at 80 km/h and for rest half of the time at 40 km/h. If the total distance covered is 60 km, what is the average speed of the car?

The correct option is A 60 km/h Time average speed = v1 t2+v2 t2t =v1+v22 =80+402 =60km/hr.

A car moves for half of the total time of travel at 80 km/h and for rest half of the time at 40 km/h.

If the total distance covered is 60 km, what is the average speed of the car?

The correct option is A
60 km/h

Time average speed = $\frac{v_{1} \frac{t}{2} + v_{2} \frac{t}{2}}{t}$

= $\frac{v_{1} + v_{2}}{2}$

= $\frac{80 + 40}{2}$

= $60$ km/hr.