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First, you multiply 55 by however many times you think it goes into 385.
EXAMPLE: 55
x 6
____
330
Then you either add or subtract ( depending on your product) to/from the number that isn't 55.
EXAMPLE: 55
x 67
_____
385
its 385
Pairs of positive integer factors of 385 are: 1 x 385 = 385 5 x 77 = 385 7 x 55 = 385 11 x 35 = 385 And their reverses.
Rate = distance /time, so time = distance/rate = 385/55 = 7 hours.
These numbers all go into 385 evenly: 1, 5, 7, 11, 35, 55, 77, 385.
55.4545