Question

A man cover half distance with v1 speed ,
and remaining half
with speeds v2 and v3 equal time find avg. speed
​

Answer 1

Answer:

{2v1(v2 + v3 )}÷{ 2v1 + v2+ v3}

Explanation:

let total distance be s .

and the distance covered in first and second half = S1,S2 respectively= s /2.

speed in first half = v1

speed in second half ate v2 and v3 for equal time (t).

therefore,first we have to calculate the av speed in second half :-

av speed = total distance÷ total time

= {(v2)t + (v3) t } ÷2t

= (v2 + v3) ÷2

now calculating av speed for whole journey ( refer image ) ,we get

{2v1(v2 + v3 )}÷{ 2v1 + v2+ v3}

hope it's helpful .

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