Asked by Brady

Please help me with the following problem:

Joe is on a cross-country trip from New York to Los Angeles. He drives for 45.0 min at 70.0 km/h, 10.0 min at 95 km/h, and 30.0 min at 55.0 km/h, and he spends 20.0 min eating lunch and buying gas. What is the average speed for this part of his trip?
a. 67.6 km/h

b. 68.4 km/h - I did b as a guess, because I couldn't figure the answer, but I got it wrong

c. 54.7 km/h

d. 53.8 km/h

I have no idea on how to do this. I have tried distance over time tons of times, and I get different answers than the ones above. Can you guys help me please? I will greatly appreciate it.
Answered by Brady
One of the things that I did was:

Delta d
--------
Delta t

and I did:

m - m
-------
s - s

distance is m
time is s

I did both of them, but I get different answers. Thanks, if you guys help. :)
Answered by anon
its 54.7 km/s
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