Question

She runs for 6.4 miles at a speed of 4 miles per hour. For how many hours does she run?

Answer 1

4 miles per hour
6.4 miles ...? hours

6.4 / 4 = 1.6 hours

answer
she runs 1.6 hours for 6.4 miles

Answer 2

Time taken by runner to cover a distance of $6.4$ miles at a speed of $4$ miles per hour is equal to $1.6$ hours.

What is speed?

" Speed is defined as ratio of total distance covered to the total time taken."

Formula used

Speed $= \frac{Total \ distance \ covered}{Total \ time \ taken}$

According to the question,

Given,

Distance $= 6.4$ miles

Speed $= 4$ miles per hour

't' represents the time taken

Substitute the value of speed and distance to get the time in the formula,

$4 = \frac{6.4}{t} \\\\\implies t = \frac{6.4}{4}\\ \\\implies t = 1.6 hours$

Hence, time taken by runner to cover a distance of $6.4$ miles at a speed of $4$ miles per hour is equal to $1.6$ hours.

Learn more about speed here

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