Question 824121
A man cycled a distance of 42km from his village. On his return journey he increased his speed by 2km/hr and took half an hour less. Calculate the average speed on the journey from his village.
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d = r*t
42 = r*t
t = 42/r
t - 0.5 = 42/(r+2)
42/r = 0.5 + 42/(r+2)
Solve for r