73. A law firm charges $120 per hour for an associate’s time and $40 per hour for a law clerk’s time. On a certain case a client was billed $1200 for a total of 14 hours. How many hours of each type were billed?
74. Lynette can run at the rate of 10 kph and bike at the rate of 24 kph. If she runs for one-half hour longer than she bikes and she covers a total of 56 km, how long was she biking?