Brad rides his bike 20 km. he covers the distance in 45 minutes (0.75 hours). what is his speed in kilometers per hour? a. 15 km/hr b. 27 km/hr c. 44 km/hr d. 9.0 km/hr

Along wire carrying a 4.2 a current perpendicular to the xy-plane intersects the x-axis at x=−1.7cm. a second, parallel wire carrying a 3.0 a current intersects the x-axis at x=+1.7cm. part a at what point on the x-axis is the magnetic field zero if the two currents are in the same direction? express your answer to two significant figures and include the appropriate units.