Question 919663
Once a year Julian travels from his home 'A' to the stadium 'D' a total distance of 96km.For the first part of his journey he was given a lift from A to B which are 40km apart.He then walked for 1 hour at a speed of ykm/h to C.Then he rode a bicycle for 2 hours at a speed which is three times his walking speed to D.
1. Write down an expression for the cycling speedin terms of y, and then find y in km/h.
2. Calculate his average speed in km/h for the journey BCD.

Once a year Julian travels from his home 'A' to the stadium 'D' a total distance of 96km.


from A to B which are 40km apart.

He then walked for 1 hour at a speed of y km/h to C.
distance = y km

Then he rode a bicycle for 2 hours at a speed which is three times his walking speed to D. at 3ykm/h

3y*2 = 6y km

40 + y+6y=96

7y=56

y=8 walking speed

3y =24 km/h


2. Calculate his average speed in km/h for the journey BCD.

y+6y/3
7y/3