About crew rowed 16kilometers downstream, with the current, in 2 hours. the return teip upstream, against the current, covered the same distance but took 4 hours. find the crew's rowing rate in still water and the rate of the current

Solving for both velocities:

16 km / 2 hours = 8 km per hour downstream

16 km / 4 hours = 4 km per hour upsteram

bsw means boat speed in still water  cs means current speed

bsw - cs = 4 km per hour

bsw + cs = 8 km per hour

Adding both equaions:

2 bsw = 12 km per hour

boat speed = 6 km per hour

bsw + cs = 8  then

current speed = 2 km per hour

Source:  1728.com/veloccal.htm

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