Acar travels 240km in 4h what’s the cars velocity

The car's speed is 240km/4hr= 60km/hr.

There's not enough information given in the question to determine its velocity.

velocity=distance/time

240 : 4 = 60 Km/h

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

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