A man walks at a speed of $6 km/h$ for $1 km$ and $8 km/h$ for next $1 km$ . What is his average speed for the walk of $2 km$ ?

5 km/h

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6 km/h

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7 km/h

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8 km/h

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Solution

The correct option is C $7 km/h$
Distance travelled is $2 km$
Time taken $= \frac{1 km}{6 km/hr} + \frac{1 km}{8 km/hr}$
Time taken $= \frac{1}{6} + \frac{1}{8}$ $= \frac{7}{24} hr$
Average speed $= \frac{2 km \times 24}{7 hr}$ $= \frac{48}{7} km/hr$
Average speed $\approx 7 km/hr$

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A man walks at a speed of 6 km/h for 1 km and 8 km/h for next 1 km. What is his average speed for the walk of 2 km?

The correct option is C 7 km/hDistance travelled is 2 km Time taken =1 km6 km/hr+1 km8 km/hr Time taken =16+18 =724 hr Average speed =2 km×247 hr =487 km/hr Average speed ≈7 km/hr

A man walks at a speed of $6 km/h$ for $1 km$ and $8 km/h$ for next $1 km$ . What is his average speed for the walk of $2 km$ ?

The correct option is C $7 km/h$
Distance travelled is $2 km$
Time taken $= \frac{1 km}{6 km/hr} + \frac{1 km}{8 km/hr}$
Time taken $= \frac{1}{6} + \frac{1}{8}$ $= \frac{7}{24} hr$
Average speed $= \frac{2 km \times 24}{7 hr}$ $= \frac{48}{7} km/hr$
Average speed $\approx 7 km/hr$