A man travels 600 km partly by train and partly by car. If he covers 120 km by train and the rest by car, it takes him 8 hours. But if he travels 200 km by train and the rest by car, he takes 20 minutes longer. Find the speed of the car and that of the train.

6 men and 8 boys can finish a piece of work in 14 days while 8 men and 12 boys can do it in 10 days. Find the time taken by one man alone and by one boy alone to finish the work.

The solution of the simultaneous equations 3x - 2y = 5 and x + 2y = -1 is :

1. x = 1, y = 1

2. x = 1, y = -1

3. x = -1, y = 1

4. x = -1, y = -1