A car travels 70 km h for one and half hours Then it travels for 3 hours at 50 km h After that ...........

Quant (SSC) Time & distance

A car travels 70 km/h for one and half hours. Then it travels for 3 hours at 50 km/h. After that it covers 105 km in one and half hours. What is the average speed of the car for the whole journey?

50 km/h

45 km/h

40 km/h

60 km/h

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Explanation:

The distance travelled at 70 km/h is 70 x 1 1/2 = 105 km
The distance travelled at 50 km/h is 50 × 3 = 150 km
The total distance travelled is 105 + 150 + 105 = 360 km
and time taken is 1 1/2 + 1 1/2 + 3 = 6 hours
∴ Average speed of car fro who journey = 300/6 = 60 km/h