A pipe can fill a tank in 100 minutes. In how much time (in seconds) can it fill 80 percent of the tank?
Show answer & explanation
Correct answer: C
Explanation
Time to fill 100% of the tank = 100 minutes
Time to fill 80% of the tank = 100 × 80 / 100
= 80 minutes
= 80 × 60
= 4800 seconds