1 Let Lao Wang be X, Lao Li be (X+68) and Lao Zhang be (X+68-35).

(X+68-35)+(X+68)+X=962

X=287

Lao Wang 287 yuan, Lao Li 355 yuan, Lao Zhang 320 yuan.

2 Set the uphill distance = downhill distance = one meter.

2a/(A/30+A/50) = 2 * 30 * 50/(30+50) = 37.5m/s.