A motor boat covers some distance in a river in favorable flow in 3 hours. and covers the same distance in upstream in 7/2 hours. If the speed of water is 1.5 km/h then what will be the speed of the vote in still water?

• A. 15 किमी/घंटा
• B. 19.5 किमी/घंटा
• C. 17.5 किमी/घंटा
• D. 19 किमी/घंटा