A 12.0 V battery is connected to two resistors in series:
R1 = 12.00 , R2 = 4.00 .

The Req is 16 ohm, total current is same for both i.e. 0.75A  and voltage are 9V and 3V for resistor R1 and R2 respectively.

Explanation:

V(total)= I(total) * Req

or, I(total)=V/Req=12/16=0.75 amp.

Now,

Voltage across R1= I(total) * R1= 0.75* 12=9V

Voltage across R2= I(total) * R2= 0.75* 4=3V

the total distance traveled by the car is

30km + 49km = 79 km .

the tires are rotating at 0.434 rpmlinear speed=45 m/sdiameter=0.550 mradius=0.275 mnow v= rωω= v/rω=45/0.275ω=163.6 rad/sω=163.6 rad/s (1rev/2π rad) (60s/1m)ω=1563 rpm