Question
Asked Mar 2, 2020
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Naoki bikes the 36 mi to Hillsboro averaging a certain speed. The return trip is made at a speed that is 3 mph slower. Total time for the round trip is 7 hr. Find Naoki’s average speed on each part of the trip.

Use rt = d

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Expert Answer

Step 1

According to the given information, the distance Naoki travels to Hillsboro is 36 mi. Total time for the round trip is 7 hours. The return trip is made at a speed that is 3mph slower.

So, by using the formula rate(r) = distance (d) / time (t)

Advanced Math homework question answer, step 1, image 1

Step 2

Now, the total time is 7 hours. So,

Advanced Math homework question answer, step 2, image 1

Step 3

Now, solve the quadratic equation using discriminate method.

Advanced Math homework question answer, step 3, image 1

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