a train weighs 120,000 pounds
it can travel, using diesel fuel, 16 kilometers in one hour--[it has unlimited fuel]
You don't state the size of the diesel tank, nor the battery capacity. The problem states rates, only. If it were to say, "...diesel... 16 km FOR one hour", etc. then it might make more sense.
I'll assume these are rates for the given hour.
It is DESIRED that he DOES use all 3 means simultaneously. For diesel and battery power (16+ 4): 20 km / hour for the first 2 hours. That's an average speed of 10 km/ hr., After that he's at the mercy of the wind. So long as the wind keeps up, he can keep the train moving along slowly, at 2 km /hour indefinitely. After the 3rd hour his average speed will be 22 km/3 hours = 7.3333 km/ hour. After 4 hours it will be 24 km / 4 hours = 6 km/hr. Then 26 km / 5 hours...it can travel 4 kilometers in one hour using elect generators.
--
won't 3 resources give it more speed?
kkemper@mindspring.com
2007-08-17
14:03:29
·
1 answers
·
asked by
kemperk
7
in
Other - Destinations