Question

Holly rode her bike for 24 miles at 6 miles per hour. She finished her ride at 1:00 p.m.

Which explanation correctly tells how to calculate what time Holly started her bike ride?



A.


Step 1 Divide: 24 ÷ 6.

Step 2 Subtract the quotient from 1:00 p.m.

Step 3 Write the answer as 9:00 a.m.


B.


Step 1 Divide: 6 ÷ 24.

Step 2 Subtract the quotient from 1:00 p.m.

Step 3 Write the answer as 12:45 p.m.


C.


Step 1 Divide: 24 ÷ 6.

Step 2 Subtract the quotient from 1:00 p.m.

Step 3 Write the answer as 9:00 p.m.


D.


Step 1 Divide: 6 ÷ 24.

Step 2 Subtract the quotient from 1:00 p.m.

Step 3 Write the answer as 12:45 a.m.

Answer 1

time = distance/speed
Since you want to find the time Holly spent riding, you need to divide her distance (24 miles) by her speed (6 miles/hour) to get the number of hours (4) that she rode. Her starting time added to the time spend riding will give her ending time. One must subtract the riding time from the ending time to find the starting time.

Selection A is appropriate.