a) 85 minutes
b) 115 minutes
c) 120 minutes
d) 125 minutes
Answer: b
Explanation: Downstream (steamer) = 40 min
Downstream (boat) = 60 min
Upstream (steamer) = 60 min
Upstream (boat) = 90 min
Required time = 40 + 30 + 45 = 115 minutes
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