A particle covers 1/4th of the total distance at a speed of 20 kmh, 12 of the total distance at a
speed of 40 kmh, 1/6th of the total distance at a speed of 10 km/hr and remaining 1/12th of the
distance at a speed of 30 km hr. What is the average speed in km/hr
Answers
Answer:
Let the total distance travelled be x km Then total time taken = x/3/10 + x/3/20 + x/3/60 = x/30 + x/60 + x/180 = 6x + 3x + x/180 = 10x/180 = x/18 .
Explanation:
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Answer:
22.5km/hr
Explanation:
Average speed = total distance /total time
Total distance = S/4+S/2+S/6+S/12
= 12S/S = S
Total time = distance/speed
= S/4/20 + S/2/40 +S/6/10 +S/12/30
= S/80 + S/80 +S/60 + S/360
= 2S/80+7S/360
= S/40+7S/360 = (360S+280S) /(360×40)= S/22.5
Average speed = S/S/22.5 = 22.5 km/hr