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if a car travels at 20 mph for 2 miles and 40 mph for 8 miles, what is the average rate?

2006-11-15 14:49:24 · 3 answers · asked by sammmm s 1 in Science & Mathematics ➔ Mathematics

3 answers

Total distance = 10 miles
Total time = (6+12)minutes = 18 minutes = 18/60 hours = 0.3hours
Average speed = total distance/time taken = 10/0.3 = 33.3mph

2006-11-15 15:05:56 · answer #1 · answered by martina_ie 3 · 0⤊ 0⤋

20mph for 2 miles took 0.1 hr; 40mph for 8 miles took 8/40 = 0.2 hr The total time is then 0.3 hr, during which he covered 10 miles; so 10 mi in 0.3 hr is 33 mph.

2006-11-15 23:00:01 · answer #2 · answered by gp4rts 7 · 0⤊ 0⤋

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