Three runners A,B and C run a race, with runner A finishing 12 meters ahead of runner B and 18 meters ahead of runner C, while runner B finishes 8 meters ahead of runner C. Each runner travels the entire distance at a constant speed. The length of the race is
A pilot takes off and flies 35 km West then, it turns South and flies 15 km, then it turns to its left and flies 20 km, then it turns north and flies 15 km. Where is the plane now with respect to its starting position?