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Amholloway13
17.03.2020 •
Mathematics
Jill swam 200 meters in 2 minutes and 42 seconds. If each lap is 50 meters long, which time is her estimated, time, in seconds, per lap?
A. 32
B. 60
C. 48
D. 40
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Ответ:
D. 40
Step-by-step explanation:
First, calculate the total time she took in seconds.
Convert minutes to seconds using 60 seconds = 1 minute
2 min X 60 s = 120 s
Total time = 120 s + 42 s = 162 s
Calculate the total number of laps.
Convert metres to laps using 50 metres = 1 lap
Laps = 200 m ÷ 50 m = 4 laps
Divide the total time by the number of laps to calculate the unit rate, which is time per one lap.
Since it says to estimate, round 162 seconds.
162 s ≈ 160 s
160 s ÷ 4 laps ≈ 40s/lap
Her estimated time per lap is 40s.
Ответ:
10green
4yellow
(8/12*2/12)+(10/12*2/12)
=36/288
=1/8