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Ram covers first 45 km at the speed of 15 km/hr. He covers next 40 km at the speed of 20 km/hr. He covers next 60 km at the speed of 30 km/hr. What is the average speed of Ram?1. 96/5 km/hr2. 145/7 km/hr3. 83/3 km/hr4. 121/9 km/hr |
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Answer» Correct Answer - Option 2 : 145/7 km/hr Given: Ram covers first 45 km at the speed of 15 km/hr He covers next 40 km at the speed of 20 km/hr. He covers next 60 km at the speed of 30 km/hr Formula used: Average speed = Total distance/Total time Calculation: Total distance covered = 45 + 40 + 60 = 145 km Total time = (45/15) + (40/20) + (60/30) = 7 hr ∴ Average speed = 145/7 kmph |
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