Two tons of water is pumped into a tank 15 ft. high in 5 minutes. determine the power output of the pump.

Assuming short tons,
.. (2000 lb/ton)*(2 ton)*(15 ft)/(5 min) / (33000 ft·lb/min)/(1 hp)
.. = (2000*2*15/(5*33000) hp
.. ≈ 0.364 hp

If you want something other than horsepower, you need to Google the desired conversion.

)because it's going in order of the math sign