A car travels from city A to city B at 30 km/hr and returns at 45 km/hr. Find the average speed for the entire trip.
36 km/hr
For equal distances covered at speeds a and b, average speed = \(\frac{2ab}{a + b}\).
Average speed = \(\frac{2 \times 30 \times 45}{30 + 45}\) = \(\frac{2700}{75}\) = 36 km/hr.
Hence, the answer is 36 km/hr.
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Important Questions from Average Speed
A person covers a certain distance at the speed of 60 kmph and returns to the starting point at a speed of 40 kmph . Find the average speed (in km/hour) of the person for the whole journey.
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