(280-240)x=400

40x=400

x= 10

A: 10 minutes later, A ran one lap more than B.

Suppose two cars meet after x hours.

(95+85)x=270

180x=270

x= 1.5

95× 1.5 = 142.5km

A: After 1.5 hours, the two cars will meet, and the meeting place is 0/42.5 kilometers away from Shanghai/kloc-0.

(When the unit is kilometers, answer question 2,270)