Cars A and B are travelling in the same direction along a straight road. The time t is in
seconds.
At t=0, car A is at rest. It accelerates at 3 ms for 0->10 t and then travels at a
constant speed.
Car B travels at 15 ms for 0->30 t and then accelerates at 1 ms until it reaches a
speed of 25 ms, after
which it continues at this constant speed.
(c) Given that car A is 500
m behind car B at t=0, at what value of r does car A
catch up with car B?