Question : In a race, there are 4 members in a team. Each member has to cover 5 km one after another. If the total time taken is 30 minutes, then what would have been the average speed?
Option 1: 50 km/hr
Option 2: 40 km/hr
Option 3: 50 m/sec
Option 4: 40 m/sec
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Correct Answer: 40 km/hr
Solution : There are 4 members. Each member has to cover 5 km one after another. ⇒ Total distance covered by the 4 members = 5 $×$ 4 = 20 km Total time taken = 30 min = $\frac{1}{2}$ hour $\therefore$ Average speed $=\frac{\text{Total distance}}{\text{Total time}}= \frac{20}{\frac{1}{2}}=20\times 2 = 40$ km/hr Hence, the correct answer is 40 km/hr.
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