the speed limit on an 86.0 mile highway was changed from 55.0 mi/h to 75.0 mi/h. how much time was saved on the trip for someone traveling at the speed limit

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.