Question : A car travels a certain distance at 70 km/hr and comes back at 30 km/hr. Find the average speed for the total journey.
Option 1: 42 km/hr
Option 2: 50 km/hr
Option 3: 34 km/hr
Option 4: 58 km/hr
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Correct Answer: 42 km/hr
Solution : Given: The car goes at speed($S_1$) = 70 km/hr The car returns at speed($S_2$) = 30 km/hr Average speed = $\frac{2×S_1×S_2}{S_1+S_2}$ (for the same distance at different speeds) = $\frac{2×70×30}{70+30}$ = $\frac{4200}{100}$ = 42 km/hr Hence, the correct answer is 42 km/hr.
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