SOLUTION: Alice is in a 20-km race. She always runs the first half at an average speed of 2 km/h faster than the second half.
a.) Let 'x' represent her speed in the first half. Determin
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-> SOLUTION: Alice is in a 20-km race. She always runs the first half at an average speed of 2 km/h faster than the second half.
a.) Let 'x' represent her speed in the first half. Determin
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Question 856984: Alice is in a 20-km race. She always runs the first half at an average speed of 2 km/h faster than the second half.
a.) Let 'x' represent her speed in the first half. Determine a simplified expression in terms of 'x' for the total time needed to run the race.
b.) If Alice runs the first half at 10 km/h, how long will it take her to run the race, to the nearest tenth of an hor. Answer by ewatrrr(24785) (Show Source):
Hi,
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a) = time
b) = 1 + 5/4 hr 0r 2hr 15min
My set up would have been using (x+2) for the first half speed and x for the second half.
Result the same, of course. always encourage people to "write" as they read. = time
(x+2) = 10 ⇒ x = 8
10/10 + 10/8 = 1 5⁄4 hr
