Question

A scooterist goes to a place at a speed of 20 km/hr and returns from there at a speed of 30km/hr. Find the average speed in km/hr for the entire journey

Answer 1

Answer in attachment

Answer 2

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A scooterist goes to a place at a speed of 20 km/hr and returns from there at a speed of 30km/hr. Find the average speed in km/hr for the entire journey

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{ According to question }

Speed of scooterist is 20 km/hr &

30 km/hr

Hence we know that

Case 1 :-

Distance = 20 km & Time = 1 hour

Case 2 :-

Distance = 30 km & Time = 1 hour

Now to find average speed

${ \bf{ \small {\dashrightarrow{Average \: speed = \frac{ Total \: distance }{Total \: time} }}}}$

${ \bf{ \small {\dashrightarrow{Average \: speed = \frac{ 20 + 30}{1 + 1} }}}}$

${ \bf{ \small {\dashrightarrow{Average \: speed = \frac{ 50}{2} }}}}$

${ \bf{ \small {\dashrightarrow{Average \: speed = 25 \: km/hr }}}}$

Hence the average speed for the entire journey is 25 km/hr.