Please help with this math probleam ;p?

Please help with this math probleam ;p?

Postby cnychwr » March 16th, 2014, 6:49 am

“Bill can mow a lawn in 2 hours. Quentin can mow the same lawn in 1.5 hours. About how long will it take to mow the lawn if Bill and Quentin work together?
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Please help with this math probleam ;p?

Postby greyson94 » March 16th, 2014, 6:50 am

Bill can mow a lawn in 2 hours
He mows 1/2 = 0.5 lawns per hour
Quentin can mow a lawn in 1.5 hours
He mows 1/1.5 = 2/3 of a lawn per hour.
Together they can mow 0.5 + 2/3 lawns per hour = 0.5 + 0.667 = 1.167 lawns
So 1 lawn will take 1/1.667 = 0.857 hours ( = 51 mins 12 seconds)
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Please help with this math probleam ;p?

Postby beacan33 » March 16th, 2014, 7:10 am

1.75 hr find the mean add both and divide by 2
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Please help with this math probleam ;p?

Postby absalon » March 16th, 2014, 7:15 am

2 hrs and 30 min? Im guessing
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