CTS Company Numerical Ability Clocks and Calendars

John swims with the current at 12kmph. The speed of the river is 3kmph. At what speed could John swim against the current?

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In a river flowing at a speed of 4kmph, a speed boat goes 12km upstream and back to the starting point in 50 minutes. Find the speed of the speed boat in still water. Sugar worth 40 Rs per kg, 50 per kg and x Rs per kg are mixed in the ratio 2:3:4 to get a mixture worth 50 Rs per kg. Find the value of x.