+0  
 
+5
468
2
avatar

Two b***s A and B rotate along a circular track. Ball A makes 2 full rotations in 26 minutes. Ball B makes 5 full rotation in 35 minutes. If they start rotating now from the same point, when will they be at the same starting point again?

 Feb 29, 2016
 #1
avatar
0

Since the LCM of 26, 35 is:910, therefore the two b***s will synchronize their rotations again in 910 minutes from the same starting point.

 Feb 29, 2016
 #2
avatar+129845 
0

Ball A makes one full rotation every 13 minutes

 

Ball B makes one full rotation every  7 minutes

 

So.....they will  be back at the same starting point in 13 * 7   =  every  91 minutes

 

In  that time, Ball A will complete 7 full rotations,  and Ball B will complete 13 full rotations.

 

 

 

cool cool cool

 Feb 29, 2016

2 Online Users