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A person covers the first 176 kilometers at a speed of 16 kilometers/hour and the next 64 kilometers at a speed of 32 kilometers/hour. What would be the approximate average speed for the first 240 kilometers of the journey?A. 13 Km/hB. 27 Km/hC. 18.5 Km/hD. 21 Km/h1. B2. D3. A4. C |
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Answer» Correct Answer - Option 4 : C Given: Total distance = 240 km Speed for 176 km = 16 km/hour Speed for 64 km = 32 km/hour Formula used: Speed = Distance/Time Average speed = Total distance/total time Calculation: According to question Time required to cover 176 km, Time = Distance/speed ⇒ 176/16 = 11 hour Time required to cover 64 km, Time = Distance/speed ⇒ 64/32 = 2 hour Total time required to cover 240 km = 11 + 2 = 13 hour Average speed = Total distance/total time ⇒ 240/13 ⇒ 18.46 km/hour ∴ The approximate average speed for the first 240 kilometers is 18.5 km/hour |
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