Ben takes 2 hours to wash 500 dishes and Frank takes 3 hours to wash 450 dishes. How long will they take, working together, to wash 1,000 dishes?
2007-01-24 05:22:37 · 7 answers · asked by Math Freak 1990 1 in Education & Reference ➔ Homework Help
Ben washes dishes at a rate of 250 dish/hr (500/2)
and Frank washes dishes at a rate of 150 dish/hr (450/3)
Their combined rate is 250 + 140 = 400 dishes/hr
1000/400 = 2.5 hours.
2007-01-24 05:26:18 · answer #1 · answered by feanor 7 · 1⤊ 0⤋
It takes 2 and a half hours. To get the answer you take 500 divided by 2. This will give you how many dishes Ben does in an hour. Your do the same to Frank. Ben can wash 250 dishes and Frank 125. Add them together to get 400. Then take 1000 and dived it by 400 to get 2.5.
2007-01-24 05:30:55 · answer #2 · answered by stargazer08 3 · 0⤊ 0⤋
Ben washes 250 dishes per hour while frank washes 150, so therefore it would take them 2 and a half hours together to wash 1000.
2007-01-24 06:15:23 · answer #3 · answered by Kara S 1 · 0⤊ 0⤋
It would normally take 2.5 hours, but Ben has to go to the doctor in an hour. So, Frank will have to step up and wash more dishes or hire an illegal immigrant for $5 to pick up the slack.
2007-01-24 05:29:33 · answer #4 · answered by BrewMan 5 · 0⤊ 0⤋
Ben takes 1 hr to wash 250
Frank takes 1 hr to wash 150
So between them in an hour they wash 400
So to wash 1000 would take 2.5 hrs.
2007-01-24 05:25:35 · answer #5 · answered by rodandalisonthompson 4 · 1⤊ 0⤋
2.5 Hours
2007-01-24 05:27:11 · answer #6 · answered by Evan 2 · 0⤊ 0⤋
2.5 hours between them both
2007-01-24 05:30:15 · answer #7 · answered by singledad 7 · 0⤊ 0⤋