If a boat goes upstream at a speed of 21 km/h and comes back

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SSC CGL Tier-2 20-February-2018 Maths
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MATH

94

M: +3.00/-0.00

If a boat goes upstream at a speed of 21 km/h and comes back the same distance at 28 km/h. What is the average speed (in km/hr) for the total journey?

[SSC CGL Tier-2 20-February-2018 Maths]

A 24.5

B 24

C 25

D 25.4