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In a 200 m walk race, Zakia walks at an average speed of 5 km/h. She gives a start of 20 m to Veena and still beats her by 18 seconds. What is the average speed of Veena (in km/h)?

In a 200 m walk race, Zakia walks at an average speed of 5 km/h. She gives a start of 20 m to Veena and still beats her by 18 seconds. What is the average speed of Veena (in km/h)? Correct Answer 4

Given:

Total distance = 200 m

Speed of Zaika = 5 km/h

Concept used:

Speed = Distance/time

km/h × 5/18 = m/sec

Calculation:

Speed of Zaika in m/sec = 5 × (5/18)

⇒ 25/18 m/sec

Time taken by Zaika to cover 200 m = 200 × (18/25)

⇒ 144 sec

Time taken by Veena to complete the race = 144 + 18 = 162 sec

Distance cover by Veena = 200 - 20 = 180 m

Speed of Veena = 180/162 × 18/5

⇒ 4 km/h

∴ Veena's speed is 4 km/h

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