Answer / padmini

L.c.m(120/7-5,120/15-5) gives 60sec as answer

Answer / thilak desingh

Guys, there can be two ways of interpreting,

1) How often they meet at any point
2) How often they meet at starting point

1) LCM { L/a-b , L/b-c} = 60 seconds

2) LCM { L/a , L/b , L/c } ~ 120 seconds

Answer / manish pal

Soln: When two people are running in the same direction the relative speed is the difference in speeds of the two people.

In this case A=5 B=7 C=15

So relative speed of B wrt A is 7-5 = 3m/s
Relative speed of c wrt to a is 15-3 =15m/s

Therefore relative distances will be:
B wrt A is 120/2 =60
C wrt to A 120/12 =12

So they have to bridge this distance of 60 and 12 between them which is the LCM of 60 and 12 which is 60.

so ans is 60 sec

Answer / nisha

Time taken by 'a' to cover a circular track = 120/5 = 24
seconds
Time taken by 'b' to cover a circular track = 120/7 seconds
Time taken by 'c' to cover a circular track = 120/15 = 8
seconds

LCM of 24, 8, 120/7 = 120/7seconds = ~ 17 seconds

So the three friends will meet after ~17 seconds

Answer / surendra singh

all three friends meet at 105m

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