A circular road encloses a park. Malathi and Roshan are participated in the street competition to go round the park. Malathi takes 25 minutes to complete one circuit of the sector, while Roshan takes just 20 minutes. Assume they both begin at the same time and place and travel in the same direction. How long would take them to meet again at the starting point?
Malathi and Roshan meet at the starting point after .