The time t required to empty a tank varies inversely as the rate R of pumping.If a pump
can empty a tank in 50 min.at a rate of 650 k?L/min, how long will it take the pump to
empty the tank at 500kL/min?
A 42 ft guy wire reaches from the top of a pole to a point on the ground 15 ft. from the
pole. Find how high up the pole does the guy wire reach?
3 answers
Mira’s boat goes 12 mph in still water. It travels 45 miles upstream and back in a total time of 8
hr. What is the speed of the current?
hr. What is the speed of the current?
h^2 + 15^2 = 42^2
t=k/R
So, Rt is constant.
You want t such that 500t = 650*50
since time = distance/speed,
45/(12-x) + 45/(12+x) = 8
t=k/R
So, Rt is constant.
You want t such that 500t = 650*50
since time = distance/speed,
45/(12-x) + 45/(12+x) = 8
3 answers