Question 36
A man walks from P to Q at the rate of 5 km/h and returns from Q to P at 3 km/h. What is his average speedfor the whole journey?
Solution
here distance covered is same
therefore $$ average speed = \frac{2 x y}{x + y} $$
x = 5 km/hr
y = 3 km/hr
$$ average speed = \frac{ 2 \times 5 \times 3}{5 + 3} = 3.75 km/hr $$
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