If J can paint a room in 6 hours , and T can paint the same room in 12 hours , how long would it take J & T to paint the room together ?
Three students , Phumelo , Ivan and John painted a hall together . Phumelo spent 4 hours on the job , Ivan 3 hours and John 1 hour . They earned R2000 in total for the job . How much should Ivan receive ?