a boy go from home to school at the speed of 40 kilometre per hour and come back from home at the speed of 30 km per hour find the average of the boy
Answers
Answered by
1
Answer:
Speed, v1 = 40 km/hr
v2 = 30km/hr
VAvg = 40 + 30 / 2 = 70/2 = 35 km/hr
VAvg = 35 km/hr
Answered by
1
Answer:
34.28kmph
Explanation:
assume distance home to school X
total distance =2x
time for onward X/40
time for return X/30
avg Speed = total distance /total time
34.2
= 2x. /(x/40+x/30)
=2x/ (70x /1200)
= 2400/70=34.28
you can assume distance between school & home is 120km. ( lcm 3,4=12. and multiply o by ten for our learning)
now onward time = 120/40=3 hrs
return = 120/30 =4 hrs
total distance = 120+120 =240
total time = 3+4=7hrs
avg speed, 120/7= 34.28
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