(x- 15)/45=(x/60)+ 1

X=240 people

The original planned number of rented vehicles is (240- 15)/45=5.

(2) Rent a 45-seat car with X cars.

Rent a 45-seater car: 220*(5+ 1)= 1320 yuan.

Full car rental for 60 seats: 300*(5- 1)= 1200 yuan.

Rent four 45-seat cars, 1 60-seat car, just full, 220 * 4+300 *1=180.

1 180 & lt； 1200< 1320

So four cars with 45 seats and 1 car with 60 seats are suitable.