3 Students are running in circular tracks in a field. they take 20 seconds ,30 seconds and 40 seconds, each has to go round once. They start from the same point and at the same time.After what interval of time they meet at the same point,and how many rounds they would have made at that point.
2007-08-30 06:24:55 · 4 answers · asked by Railway rajeev 2 in Science & Mathematics ➔ Mathematics
The interval of time they meet at the same point, is the LCM of 20, 30, 40
LCM is 120. Therefore the 3 students will meet after 120 seconds at the starting point.
First One will complete 120 / 20 = 6 rounds.
the second will complete 120 / 30 = 4 rounds
and the third will complete 120 / 40 = 3 rounds.
2007-08-31 22:58:03 · answer #1 · answered by Pranil 7 · 0⤊ 0⤋
The LCM of 20,30,40 is 120. Therefore the 3 students will meet after 120 seconds at the starting point. One would have completed 6 rounds. the second 4 rounds and the third 3 rounds.
2007-08-30 13:42:05 · answer #2 · answered by chids 3 · 1⤊ 0⤋
simple..
just take HCF of 20, 30 and 40..
itz 120 seconds..
so they vil meet in 2 min.
2007-08-30 13:36:23 · answer #3 · answered by Anonymous · 0⤊ 0⤋
120 seconds
2007-08-30 13:30:27 · answer #4 · answered by gebobs 6 · 0⤊ 1⤋