Two balls A and B rotate along a circular track. Ball A makes 2 full rotations in 26 minutes

Two balls A and B rotate along a circular track. Ball A makes 2 full rotations in 26 minutes

Two balls 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?

Answer：After 1 hour and 31 minutes