Question

Roy runs over a bridge with a speed of 2 m/s. When he reaches the end of the bridge, he turns and runs back to the starting point with a speed of 4 m/s. Find the average speed of Roy.

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Answer 1

Answer:

the answer is 3m

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Answer 2

Answer:

The avg speed of Roy is 8/3 m/s.

Step-by-step explanation:

As per the question,

We need to find the average speed of Roy.

As we know, The given information is:

While travelling to the first end:

Let distance be = d

Speed of travel = 2 m/s

So, time (t1)= d/2

While travelling to the second end:

distance = d

Speed of travel = 4 m/s

So, time (t2)= d/4

Now, while calculating avg speed

Time = t1+t2

$\frac{d}{2} +\frac{d}{4}\\\\ \frac{2d+d}{4} \\\\\frac{3d}{4}$

distance = 2d

So, avg speed = total distance / total time

$\frac{2d}{\frac{3d}{4} } \\\\\frac{8}{3} m/s$

Hence,

The avg speed of Roy is 8/3 m/s.

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