Donna and phyllis are reviewing for a math final. they have 150 pages to cover. donna can review 37 pages an hour, but phyllis can only go 2/3 as fast as donna. about how long does it take each girl to finish?

Donna: 37 pages per hour.  There are 150 pages.
Time: 150 pages  / (37 pages/hour)
= 150/37 hours
= 4 hours 3 1/2 min. (approx.)

Phyllis: (2/3)*37 pages per hour.  There are 150 pages.
Time: 150 pages / ((2/3)*37 pages / hour )
= 150*3/(2*37) hours
= 225/37 hours
= 6 hours 5 minutes (approx.)

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The answer is all about the number 4