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Clear-thinking mathematics
Son, this problem can only be solved by equations, which mainly tests your ability to do equations. You can set the walking speed to x, so the walking time is 3.5/X, because the distance runs fast, so (1)3.5/3 divided by 4X is the running time, and the latter two thirds are jogging, so the jogging time is (2)3.5x2/3 divided by 2X. Then subtract the sum of (1)(2) from 3.5/X =35. The equation is (7/2x)-[(7/24x)+(7/6x)] = 3549/24x = 35x = 7/120, so the walking time is 3. Is that clear enough? Typing is not easy. Take it.