Question
A person travels 600 km by train at 80km/hr, 800 km by ship at 40 km/hr 500 km by aeroplane at 400 km/hr and 100 km by car at 50km/hr. What is the average speed for the entire distance ?
Answer: Option C
Answer: (c)Using Rule 3,Total time= $600/80 + 800/40 + 500/400 + 100/50$= $246/8$ hours.Average speed= ${600 + 800 + 500 +100}/{246/8}$= ${2000 × 8}/246 = 65{5}/123$ km/hr.
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Answer: (c)Using Rule 3,Total time= $600/80 + 800/40 + 500/400 + 100/50$= $246/8$ hours.Average speed= ${600 + 800 + 500 +100}/{246/8}$= ${2000 × 8}/246 = 65{5}/123$ km/hr.
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