A man travels 600 km by train at 80 km hr 800 km by ship at 40 km hr 500 km by aeroplane at 40...........

Quantitative Aptitude ( CCS) Time & distance

A man travels 600 km by train at 80 km/hr, 800 km by ship at 40 km/hr, 500 km by aeroplane at 400 km/hr and 100 km by car at 50 km/hr. What is the average speed for the entire distance?

60 km/hr

60 5/123 km/hr

62 km/hr

65 5/123 km/hr

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Explanation:

Total distance Travelled = (600 + 800 + 500 + 100)km = 2000 kms
Total Time Taken = (600/80 + 800/40 + 500/400 + 100/50) = 123/4 hrs
Average Speed = Total Distance/Total Time = 2000/(123/4) = 2000 * 4/123 = 8000/123 = 65 5/123 km/hr