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13 Jan 2004, 17:49
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A boat travels from City A to City B upstream and returns from City B to City A downstream. If the speed of the boat in still water is 40 mph and the speed of the stream is 20 mph, what is the average speed of the journey?
a. 30 mph
b. 32 mph
c. 40 mph
d. 47 mph
3. 60 mph
a. 30 mph
b. 32 mph
c. 40 mph
d. 47 mph
3. 60 mph
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13 Jan 2004, 17:57
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Plug. Say the trip was 240 miles each way.
Upstream, 240 miles at 20 mph, 12 hours.
Downstream 240 miles at 60 mph, 4 hours.
16 hours, 480 miles.
480/16= 30 mph
Upstream, 240 miles at 20 mph, 12 hours.
Downstream 240 miles at 60 mph, 4 hours.
16 hours, 480 miles.
480/16= 30 mph
13 Jan 2004, 18:00
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Very Good!
I did not think to plug a figure in as the total miles. I solved it traditionally.
Jolly good then
I did not think to plug a figure in as the total miles. I solved it traditionally.
Jolly good then
