SSC GD Constable 5 Feb 2025 Shift 1 Paper

Section: Elementary Mathematics

Question : 55 of 80

Marks: +1, -0

A man goes to Ahmedabad from Kolkata at a speed of 78 km/hr and returns to Kolkata at speed of 91 km/hr, through same route. What is his average speed (in km/hr) of the entire journey?

Validate

Solution:

Average Speed

=\;{2 × S_1 × S_2}/{S_1+S_2}

Where,

S _1=

Speed from Kolkata to Ahmedabad

=78 km \/ hr

S _2=

Speed from Ahmedabad to Kolkata

=91 km \/ hr

Calculation:
Average Speed

=\;{2 × 78 × 91}/{78+91}

⇒ Average Speed

=\;{2 × 78 × 91}/{169}

⇒ Average Speed

=84 km \/ hr

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