SOLUTION: Suppose a driver with car leaves home at 8AM and first travels 30 km/hr for two hours, then stops one hour for coffee. He then travels at 80 km/hr for the next five hours, to arriv

Question 1194742: Suppose a driver with car leaves home at 8AM and first travels 30 km/hr for two hours, then stops one hour for coffee. He then travels at 80 km/hr for the next five hours, to arrive at the destination. (we imagine a magical car that does not need to accelerate or decelerate)
1. How many hours was this trip, from start to finish?
2. At what time did the driver arrive at the destination?
3. How many km did the driver cover?
4. what was the average rate of speed (including the rest time!), in km/hr for the entire trip?

Found 3 solutions by ankor@dixie-net.com, ikleyn, MathTherapy:
Answer by ankor@dixie-net.com(22740)   (Show Source): You can put this solution on YOUR website!
Suppose a driver with car leaves home at 8AM and first travels 30 km/hr for two hours, then stops one hour for coffee.
He then travels at 80 km/hr for the next five hours, to arrive at the destination.
(we imagine a magical car that does not need to accelerate or decelerate)
:
1. How many hours was this trip, from start to finish?
2 + 1 + 5 = 8 hrs
2. At what time did the driver arrive at the destination?
8 Am + 8 = 16 which is 4 pm
3. How many km did the driver cover?
(30*2) + (80*5) = 460 km
4. what was the average rate of speed (including the rest time!), in km/hr for the entire trip?
km/hr
Answer by ikleyn(52781)   (Show Source): You can put this solution on YOUR website!
.

Is not everything is obvious ?

Or you need to explain obvious things to you ?

By the way, a standard answer to question (2) is only "partly correct".

It is correct under the assumption that the starting point and the destination point are in the same time zone.

If these points are in different time zones, then the answer is different.

Answer by MathTherapy(10552)   (Show Source): You can put this solution on YOUR website!

Suppose a driver with car leaves home at 8AM and first travels 30 km/hr for two hours, then stops one hour for coffee. He then travels at 80 km/hr for the next five hours, to arrive at the destination. (we imagine a magical car that does not need to accelerate or decelerate)
1. How many hours was this trip, from start to finish?
2. At what time did the driver arrive at the destination?
3. How many km did the driver cover?
4. what was the average ~~rate of speed~~ rate/speed (including the rest time!), in km/hr for the entire trip?

Question 4 doesn't make sense, since the AVERAGE RATE/SPEED for the entire trip definitely DOES NOT INCLUDE rest time - as in the
time (1 hour) he stopped for coffee.
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