A biker boy decides to have an adventure by climbing mountain.He starts his bike and attains a speed of 1 km per hour.As soon as he reaches up,he decides to go back with speed of 9 km/hr.Calculate average speed of the entire journey.
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Answer:
Average speed is 5
Step-by-step explanation:
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avg speed = distance/time
Distance as d
Up
speed = distance/time
1 km = d / t1
t1 = d/1 = d
Down
9km = d / t2
t2 = d / 9
Avg speed = total distance / total time
Avg speed = 2d / d + d/9
= 2d / d( 1 + 1 /9
= 2/ 9 + 1 / 9
= 2 /10 / 9
= 2 × 9 /10
= 18 / 10
= 1.8
Avg speed = 1.8 km/hour
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