If the motorcycle speed is X, the emergency repair speed is1.5x.

30/x- 15/60=30/ 1.5x

10/x= 15/60

X=40 motorcycles

1.5x=60 Repair the vehicle

2

Set at least x questions correctly.

10x-(20-x)* 3 & gt； Equal to 70

13X > equals 130.

X> equals 10.