Question : A car travels from A to B at 44 km/hr and returns from B to A at 66 km/hr. Find its average speed during the whole journey.
Option 1: 63.3 km/hr
Option 2: 52.8 km/hr
Option 3: 68.2 km/hr
Option 4: 55.4 km/hr
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Correct Answer: 52.8 km/hr
Solution : $S_1$ = 66 km/hr $S_2$ = 44 km/hr Average speed = $\frac{2S_1S_2}{S_1+S_2}$ = $\frac{2×66×44}{66 + 44}$ = $\frac{2×66×44}{110}$ = $\frac{264}{5}$ = 52.8 km/hr Hence, the correct answer is 52.8 km/hr.
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