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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.
Answer by mananth(16946)   (Show Source):
You can put this solution on YOUR website! 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
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