Latest Infosys Aptitude Question SOLUTION: One gear pulley rotates at a speed of 3 rev/sec another gear roates at 5 rev/sec. if both start together after how many seconds will they be together again?

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One gear pulley rotates at a speed of 3 rev/sec another gear
roates at 5 rev/sec.
if both start together after how many seconds will they be
together again?

Asked In Infosys Aahana Sarkar (5 years ago)

Unsolved Read Solution (11)

Is this Puzzle helpful?   (24)   (9) Submit Your Solution Permutation and Combination

Read Solution (11) :

V manikandan  (5 years ago)

Simply 1 sec
Bcoz both pulley completes its own revolutions and return to their inital state in a sec..for example
let pulley A has point 'a' as starting point and pulley B has 'b' as starting point..
let a one second revolution..
1. 'a' and 'b' start together..its right..
2. After one second again they must return after 3 rev and 5 rev respectively..[one complete revolution is represented by its returning to the starting point..
So definitely 1second or every second is the right answer

Is this solution Helpfull? Yes (5) | No (3)  

hpg  (5 years ago)

3 rotates 3,6,9,12,15
5 rotates 5,10,15
because ans is 15

Is this solution Helpfull? Yes (4) | No (6)  

akshat  (5 years ago)

its simply the LCM of both the numbers. similar to the case of two person running in the track with diff. speed,.

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Shivam  (5 years ago)

15
lcm of both

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Anu  (5 years ago)

Its 15
Because lcm of both is 15

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rahul  (5 years ago)

L.C.M of both ,which is 15 ans

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ad  (5 years ago)

ans is 1. they have not given time .they have given frequency .so they will come at start position in 1 sec.

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NIDHI KANDARI  (5 years ago)

lcm of 3 AND 5

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  (5 years ago)

find the lcm of 3,5
it is 15

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RAHUL SHARMA  (4 years ago)

5P3*6!/2! IS THE SOLUTION

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Sourav Nayak  (2 years ago)

3 rotates 3,6,9,12,15
5 rotates 5,10,15
because ans is 15

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