This problem can be solved using elementary Algebra. Assuming that the first phase, during which Gullu runs and Guchu walks, lasts ‘x’ minutes, and the second phase ‘y’ minutes, we get two question:
X + y = 45 and 5x + 2y = 4x + 10 y
Solving the above equations we find that ‘x’ equals forty minutes and ‘y’ five. Thus Gullu runs for forty minutes. As the ratio of their speeds in the first phase.is 5:4 the two meet along the side opposite the start point after Gullu has covered two thirds of that side and Guchu one-third.