If it takes Jeny 1.88mins to swim 50m , estimate the time taken by her to swim 80m.
Time taken = [ ( 800 x ? ) / ? ] mins
= ? mins
數學問題(10分)
2007-08-29 5:06 am
回答 (5)
2007-08-29 5:13 am
time taken
=80/(50/1.88)
=3.008mins
=80/(50/1.88)
=3.008mins
2007-08-29 5:12 am
her speed is 50/1.88 mtr/min
hence, the time taken for her to swim 80m will be
time = distance / speed
= 80 / (50/1.88) min
= 3.008 min
hence, the time taken for her to swim 80m will be
time = distance / speed
= 80 / (50/1.88) min
= 3.008 min
2007-08-29 5:12 am
用比例計。
1.88/50 = time/80
time = 1.88 *80/50
1.88/50 = time/80
time = 1.88 *80/50
2007-08-29 5:11 am
Time Taken = [(800 x 1.88)/ 500] mins
= 3.008 mins
take 1.88mins to swin 50 m
therefore Jeny need 0.0376 to swin each metre
for 80m , Jeny need 3.008mins to finish
= 3.008 mins
take 1.88mins to swin 50 m
therefore Jeny need 0.0376 to swin each metre
for 80m , Jeny need 3.008mins to finish
收錄日期: 2021-04-13 13:10:10
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