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SSC CGL 2022 PYQ — Question 68

SSC CGL - 02 Dec 2022 - Shift 3 • Quantitative Aptitude • Q68

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If a man travels at 1xkm/h{{1} \over x}km/h on a journey and returns at 1x2km/h,{{1} \over x^2}km/h,  then  his average speed for the journey is :

Show answer & explanation

Correct answer: B

Explanation

The correct answer is Option 2 i.e. 2X2+X{{2} \over X^2+X}

Given:

Speed 1 = 1/x km/h

Speed 2 = 1/x2 km/h

Formula used:

Average speed = (2 × speed 1 × speed 2)/(speed 1 + speed 2)            ---- (1)

Calculations:

Using equation (1), we get

Average speed = (2 × 1/x × 1/x2)/(1/x + 1/x2)

⇒ 2/(x2 + x)