A person travels from Mumbai to Ahmedabad by car in $5$ hours. The speed of the car during first hour of journey was $60$ km/hr. For the next two hours speed was $80$ km/hr. Next hour it was $100$ km/hr. Finally, during the last hour of his journey he drove at $40$ km/hr. What is the average speed during his journey?

56

km/hr.

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67.4

km/hr.

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70

km/hr.

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72

km/hr.

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Solution

The correct option is C $72$ km/hr.
He travels by car with different speed.
For first hour, 60km/hr
For second and third hour, 80km/hr
For fourth hour, 100km/hr
For fifth hour, 40km/hr
Average speed = $\frac{(60 + 80 + 80 + 100 + 40)}{5}$ $=$ $\frac{360}{5}$ $= 72$ km/hr
Hence, Option D is correct.

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The correct option is C 72 km/hr.He travels by car with different speed.For first hour, 60km/hrFor second and third hour, 80km/hrFor fourth hour, 100km/hrFor fifth hour, 40km/hrAverage speed = (60+80+80+100+40)5 = 3605 =72km/hrHence, Option D is correct.

The correct option is C $72$ km/hr.
He travels by car with different speed.
For first hour, 60km/hr
For second and third hour, 80km/hr
For fourth hour, 100km/hr
For fifth hour, 40km/hr
Average speed = $\frac{(60 + 80 + 80 + 100 + 40)}{5}$ $=$ $\frac{360}{5}$ $= 72$ km/hr
Hence, Option D is correct.