a) 30 km
b) 24 km
c) 20 km
d) 32 km
Answer: d
Explanation:
Speed of man in still water, x = 6 km/h
Speed of current, y = 2 km/h
Let distance = M
Upstream time = Downstream time + 4
$$\eqalign{
& \frac{M}{4} = \frac{M}{8} + 4 \cr
& \frac{M}{4} = \frac{{M + 32}}{8} \cr
& M = 32 \cr
& {\text{Distance = 32 }}km \cr} $$
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