A man completes 30km of a journey at the speed of 6km/hr and remaining 40km of the journey in 5hrs. His average speed for the whole journey is:

5.38km/hr

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7km/hr

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7.5km/hr

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8km/hr

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Solution

The correct option is B
7km/hr

Average speed = $\frac{Total distance}{Total time taken}$

$\frac{30 + 40}{5 + 5} = \frac{70}{10} = 7 k m / h r$

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A man completes 30km of a journey at the speed of 6km/hr and remaining 40km of the journey in 5hrs. His average speed for the whole journey is:

The correct option is B 7km/hr Average speed =Total distanceTotal time taken 30+405+5=7010=7km/hr

The correct option is B
7km/hr

Average speed = $\frac{Total distance}{Total time taken}$

$\frac{30 + 40}{5 + 5} = \frac{70}{10} = 7 k m / h r$