SOLUTION: A boy cycles x km at y km per hour and p km at q km per hour.Find his average speed for the whole journey.

Question 325669: A boy cycles x km at y km per hour and p km at q km per hour.Find his average speed for the whole journey.
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
A boy cycles x km at y km per hour and p km at q km per hour.Find his average speed for the whole journey.
..
time taken = x/y
also
time taken = p/q
..
Total time = x/y + p/q
= xq+py /qy
Total distance = x+p km
Average speed = total distance / total time
x+p / xq+py/qy
(x+p)*qy/ (xq+py)km/hour

RELATED QUESTIONS
One third of a certain journey was covered at the speed of 25 km per hour. One forth at... (answered by Alan3354)

Mr Lim drove at 70 km per hour for 1 hour and 30 minutes. He then drove another 55 km. if (answered by Menjax)

A man travelled from point A to point B by car at a speed of 40 km. per hour and returned (answered by richwmiller)

A man goes at the speed of 5 km/hour from P to Q and returns at the speed of 3 km/hour... (answered by ankor@dixie-net.com)

Please help me to solve this question!! : one third of a certain journey was covered... (answered by josgarithmetic,Solver92311,ikleyn)

In a journey of 1000 km a train covers the first 600 km at 60k/m per hour and the... (answered by Theo)

a motorist drives 80km per hour in 5 hours and another 60 km per hour in 4 hours. find... (answered by josgarithmetic)

a motorist travels for one hour at an average speed of 72 km/h and then for two hours at... (answered by Alan3354,sachi)

a train covers a distance of 720 km at a speed of x km/h. On the return journey, it... (answered by macston)