810 dishes 2 b rinsed. John rinses in 90 min, Bob in 135. How long will it take them 2 rinse together? HELP!!
Please help! I know this is simple but I just can’t figure it out.
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Favorite Answer
John does 9 dishes per min. and bob does 6 per min.
9x + 6x = 810
15x = 810
x = 54 minutes
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Find the rate at which each rinses. For example, John’s rate is 810/90=9 dishes/minute. Do the same for Bob. Then, add the two rates together to see how many dishes they can rinse per minute when working together. Then, using the total number of dishes and the combined rinsing rate, you can get the number of minutes it will take them to rise all the dishes when working together. Hint: it will be less than 1 hour.
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Your question is confusing. Does John and Bob rinse the entire 810 dishes in the stated time? If so, then John is rinsing 9 plates per minute and Bob rinses 6 per minute. (1 1/2 more time )together they rinse 15 per minute and they finish in 54 minutes.
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MAKE A GRPH. ONE LINE HOWING HOW MANY JOHN DOES AND ANOTHER SHOWING HOW MANY BOB DOES. WHERE EVER THE LINES MEET THAT THE ANSWER. I WOULD DO IT FOR U BUT I CANT GRAPG ON THE COMPUTER. BYE!
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