(Viva Voce) Chap 9 Exercise 9 Question 10

Q 10. Towns P and Q are 120km apart. Mr tan drove from P to Q and was scheduled to reach Q after 2 hours. His average speed was 54km/h for the first 40 minutes.

a)What was his average speed for he remaining journey if he managed to arrive just on time?

b) The time taken for his return journey is 2 hour and 10 minutes. Find the average speed for

i)The return journey. ii)the whole trip.