Question 9 of 20
Three persons X, Y and Z walk around a circular path of circumference 2400 m at the rates of 180 m/min, 150 m/min and 120 m/min,
respectively. After how much time will they all be together again if all start together and walk in the same direction?
O 80 minutes
60 minutes
40 minutes
o 20 minutes
Answers
Answered by
11
Circumference of the circle is 2400 m.
let time be x seconds.
speed of the first person is 3m/s
Speed of the second person is 2.5 m/s
Speed of the third person is 2m/s.
Time for the first person to cover around the circle is 800 seconds.
Time for the second person to cover around the circle is 960 seconds.
Time for the third person to cover around the circle is 1200 seconds.
LCM of 800,960,1200 is 9600 seconds i.e. 160 minutes.
Answered by
4
Answer:
80 minutes
Step-by-step explanation:
as the previous user explained well except for the last part, the LCM will be 4800 seconds/80 minutes.
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