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A Car coves 60 km at a uniform speed of 60 km/hr.What should be its speed for the next 180 km if the average speed for entire journey is 120km/hr ?1. 200 km/hr2. 160 km/hr3. 180 km/hr4. 150 km/hr5. 175 km/hr |
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Answer» Correct Answer - Option 3 : 180 km/hr Given: Total distance = 60 + 180 = 240 km. First 60 km is covered by speed 60 km/hr. Average speed = 120 km/hr Formula used: Time = distance / speed Calculation: Hence time for first 60 km = distance / speed ⇒ 60 km / (60 km/hr) = 1 hour Time taken for total travel of 240 km with average speed 120 km/hr = 240/120 = 2 hour. Total time = 2 hour 60 km is travelled in first 1 hour. Now, Required speed for remaining 180 km in remaining time 1 hour = 180 / 1 ⇒ 180 km/hr |
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