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If a car travels a distance at a speed of 18 km/hr and comes back the same distance at 30 km/hr. What is the average speed (In km/hr) for the total journey?1. 252. 21.53. 22.54. 24 |
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Answer» Correct Answer - Option 3 : 22.5 Given: Speed while going = 18 km/hr Speed while returning = 30 km/hr Formula used: Average speed for same distance = 2ab/(a + b) Where, a = speed while going B = speed while returning Calculation: Average speed = 2ab/(a + b) ⇒ 2 × 18 × 30/(18 + 30) ⇒ (36 × 30)/48 ⇒ 90/4 ⇒ 22.5 km/hr ∴ The average speed for the whole journey is 22.5 km/hr |
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