CTS Company Numerical Ability Boats and Streams

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.

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CTS Other Question

Three burglars were caught while robbing a home, a bank and a jwellery.
x says " y had robbed the bank "
z says " y had robbed the jwellery"
y says that he is not involved in any of these.
the one who had robbed the home is speaking truth and the one who had robbed the bank is not. Identify who robbed where?
John swims with the current at 12kmph. The speed of the river is 3kmph. At what speed could John swim against the current?