SOLUTION: 1.THE TEACHER AND TWO LEARNERS ARE DRIVING TO NELSPRUIT TO ATTEND MATHEMATICS ADVANCEMENT COMPETITION(MAC).THEY HAVE TO COVER DISTANCE OF 400KM AND REACH THEIR DESTINATION IN 4HOUR

Question 951753: 1.THE TEACHER AND TWO LEARNERS ARE DRIVING TO NELSPRUIT TO ATTEND MATHEMATICS ADVANCEMENT COMPETITION(MAC).THEY HAVE TO COVER DISTANCE OF 400KM AND REACH THEIR DESTINATION IN 4HOURS.THEY STOP FOR 25MINUTES TO BUY FOOD,AFTER THEY TRAVELLED 220KM IN TWO HOURS.AT WHAT AVERAGE SPEED MUST THEY DRIVE THE REMAINDER OF THE JOURNEY TO REACH THEIR DESTINATION ON TIME
Answer by Theo(13342) (Show Source): You can put this solution on YOUR website!
they stop after 220 km that took them 2 hours.
they stop for 25 minutes.
4 hours minus 2 hours and 25 minutes means that they have 1 hour and 35 minutes to complete the trip.
400 minus 220 equals 180 km needed to finish the trip.
they need to travel 180 km in 1 hour and 35 minutes.
1 hour and 35 minutes is equal to 1.58333333... hours.
divide 180 by 1.583333333.... to get 113.6842105... kmph (kilometers per hour).
that's your solution.
they need to travel at 113.6842105... kmph for 1.58333333..... hours in order to get to their destination on time.
round your answer based on your requirements.

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