plz plz solve it

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Incognito
Incognito's picture
Below qs are from Nishit Sinha... plz solve with explanation.\

Thanks,

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
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Joined: 2008-08-21
Answer

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

Incognito
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
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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