Jack and jill raced cross-country on motor bikes. jack drove 325 miles in 5 hours; jill took 6 1/2 hours to travel the same distance as jack. compute the unit rates that describe jack's average driving speed and jill's average driving speed. show how you made your decision.

Speed = distance / time

Jack: Speed = 325 miles / 5 hours

Speed = 65 miles per hour.

Jill: Speed = 325 miles / 6.5 hours

Speed = 50 miles per hour.

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step-by-step explanation:

we want to simplify the expression,

let us change the middle bar to a normal division sign to obtain,

we multiply the first fraction by the reciprocal of the second fraction to obtain,

we factor to obtain,

we cancel the common factors to get,

we simplify to get,

the correct answer is b