The board man family walked 2/5 of a mile in 2/7 of an hour. what is their unit rate in miles per hour? : p 2/7/2/5 1 2/5 miles per hour 2/7/2/5 5/7 miles per hour 2/5/2/7 1 2/5 miles per hour 2/5/2/7 5/7 miles per hour

(2/5)/(2/7) = 1 2/5 miles per hour

Step-by-step explanation:

To find miles per hour, divide miles by hours:

(2/5 miles)/(2/7 hour) = (2/5)·(7/2) miles/hour = 7/5 miles/hour = 1 2/5 miles/hour

It is often easiest to divide fractions by multiplying by the inverse of the denominator.

(2/5)/(2/7) = (2/5)·(7/2) = (7·2)/(5·2) = 7/5

When writing a problem of this sort in text (as here), parentheses are required around the numerator and denominator of the complex fraction. The meaning of 2/5/2/7 = 1/35 is very different from the meaning of (2/5)/(2/7) = 7/5.

b

step-by-step explanation: