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4 votes
A family on vacation drives 123 miles in 2 hours, then gets stuck in traffic and goes 4 miles in the next 15 minutes . The remaining 191 miles of the trip take 3 3/4 hours. What was their average rate of speed to the nearest tenth of a mile per hour ?

User Puffin GDI
by
8.0k points

3 Answers

7 votes

The average speed of an object is the total distance traveled by the object divided by the elapsed time to cover that distance.

Total distance traveled = 123 miles + 4 miles + 191 miles = 318 miles

Total time taken = 2 hours + 15 minutes +
3(3)/(4) hours

= 2 hours +
(15)/(60) hour +
(15)/(4) hours

=
2+(1)/(4)+(15)/(4) hours

=
2+(16)/(4) hours

= 6 hours

Average speed = Total distance
/ Total time

=
(318)/(6) mile per hour

= 53 mile per hour.

User Koushik Chatterjee
by
7.7k points
0 votes
i wish i could help but i can't sorry

User Henning Koehler
by
7.8k points
5 votes

The average speed of an object is the total distance traveled by the object divided by the elapsed time to cover that distance.

Total distance traveled = 123 miles + 4 miles + 191 miles = 318 miles

Total time taken = 2 hours + 15 minutes +
3(3)/(4) hours

= 2 hours +
(15)/(60) hour +
(15)/(4) hours

=
2+(1)/(4)+(15)/(4) hours

=
2+(16)/(4) hours

= 6 hours

Average speed = Total distance
/ Total time

=
(318)/(6) mile per hour

= 53 mile per hour.

User Paras Watts
by
8.0k points
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