Three people go to Fenxi solar terms in the morning.

Let the middle point be C, and let the time taken by Party A to walk AC section X, CB section Y, and the ratio of Party A, Party B and Party C to walk AC section X: X-60: X-60-45.

The ratio of the time spent walking the CB section is y: y-24: y-24-m,

x/y = x-60/y-24 = x-60-45/y-24-m，

X/y = 60/24 = 45/ m

m=24*45/60= 18

Wang is earlier than Li 18 minutes, and earlier than Zhang 18+24=40 minutes.