plz plz solve it

3 replies [Last post]
Incognito's picture
Below qs are from Nishit Sinha... plz solve with explanation.\


A number of runners numbered 1, 2, 3. . . .N and so on, starts simultaneoulsy at the same point on a circular track and keep on running continuously in the same direction, around the track. They run in such a way that the speed of the runner numbered N (N > 1) is N times that of the runner numbered 1.

Q1. If there are exactly six runners, then at how many distintc points on the track is the runner numbered 1 overtaken by any other five runners?

a. 15
b. 11
c. 9
d. 10

Q2. If there are exactly four runners, then at how many distinct points on the track do two or more runners meet?

a. 3
b. 4
c. 5
d. 6

pratyushh's picture
Last seen: 8 years 29 weeks ago
Joined: 2008-08-21

Q1 Ans a (15)
Q2 Ans d (6)

Incognito's picture
Thanks for the answers but

Thanks for the answers but thoser ar also in the book ...Can some one solve it with explanation

Incognito's picture
Is it LCM/2 ?????if yes then

Is it LCM/2 ?????
if yes then what is the logic behind it

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