No Service * 57% 4:59 PM imathas.rationalreasoning.net Grade: 56.7/100 Print Ver

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No Service * 57% 4:59 PM imathas.rationalreasoning.net Grade: 56.7/100 Print Version When running a half marathon (13.1 miles), took Grant 7 minutes and 45 seconds to run from mile marker 1 to mile marker 2, and 19 minutes and 15 seconds to run from mile marker 2 to mile marker 4 a. As Grant's distance (in miles) from the starting line increased from 1 to 4, what was the change in the number of minutes he had been running since starting the race? minute(s) Preview b. As Grant's distance from the starting line increased from 1 to 4 miles, what average speed (in miles per minute) did he run? miles per minute Preview c. 69 minutes after starting the race Grant passed mile marker 9. What average speed in miles per minute will Grant need to run, from mile marker 9 to the end of the race, to meet his goal to complete the 13.1 mile half-marathon in 110 minutes? miles per minute Preview License Points possible: 10 Unlimited attempts.

Explanation / Answer

a) as miles increased from 1 to 4

number of minites increased from 0 to 7.45 + 19.25

= 26.7 minutes

b) average speed = total distance / total time

= 3 / 26.7

= 3 / 26.7 miles / minute

c) let average speed = s

s = total distance / total time

s = ( 13.1 - 9 ) / 110 - 69

s = 4.1 / 41 miles / minute

average speed = 0.1 miles / minute

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