Help with magnetic field problem?

Question

Could someone please help me with this problem?

Two wires carry currents of 3.00 A and 5.00 A in the same direction. If they are separated by a distance of 20cm:
a. Find the direction and magnitude of the magnetic field at a point midway between the wires
b. Find the magnitude and direction of the magnetic field at point P, located 20.0 cm above the wire carrying the 5.00 A current

Answer 1

a. (2x10^-7)(5/0.1-3/0.1)=4x10^-7T perpendicular to the plane
containing the wires