(a):it will take 15 hour for peter to paint the four room.
(b):it will take 3.6 hour for them to finish the ramaining job.
一条有关RATE的数学题,
一条有关RATE的数学题,
(a) Bob,by himself,can paint four rooms in 10 hours.If he hires Peter to help,they can do the same job together in 6 hours.If he lets Peter work alone,how long will it take for Peter to paint the four rooms?
(b) In part(a),if Bob works alone for 4 hours,and then they work together to complete the remaining job,then how long will it take them to finish the remaining job?
(a) Bob,by himself,can paint four rooms in 10 hours.If he hires Peter to help,they can do the same job together in 6 hours.If he lets Peter work alone,how long will it take for Peter to paint the four rooms?
(b) In part(a),if Bob works alone for 4 hours,and then they work together to complete the remaining job,then how long will it take them to finish the remaining job?
英语人气：523 ℃时间：2020-03-10 03:40:05
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