Question: A man rows upstream and back in 12 hours. If the rate of the current is 1.5 kph and that of the man in still

A man rows upstream and back in 12 hours. If the rate of the current is 1.5 kph and that of the man in still water is 4 kph, what was time spent downstream?

a. 1.75 hr

b. 2.75 hr

c. 3.75 hr

d. 4.75 hr

Please provide me solution through handwritten for better understanding. Thank you

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