gamingisfun
17.10.2019 •
Mathematics
Three joggers are running around a circular track. one of them completes one lap in 6 minutes, the second one in 9 minutes, and the third one in 15 minutes. what time will they arrive at their starting point together if they start at the same time from the same point at 10: 00 am and maintain their jogging pace
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Ответ:
At 11:30 am they will arrive at their starting point together
Step-by-step explanation:
we know that
One of them completes one lap in 6 minutes
The second one in 9 minutes
The third one in 15 minutes
step 1
Find the least common multiple (LCM)
6=2*3
9=3²
15=3*5
so
LCM=(3²)*(2)*(5)=90 minutes
step 2
Find the number of laps of each jogger for the LCM
jogger 1
90/6=15 laps
jogger 2
90/9=10 laps
jogger 3
90/15=6 laps
If they start at 10:00 am
then
10:00 am + 90 minutes=11:30 am
Ответ:
12 squared minus 6 squared equals 108, square root of 108 is 10.39, i don’t know if u have to round it to a decimal place but if u do, tell me