Nikhil covers 1000 km by plane at 250 km/hr, 600 km by ship at 60 km/hr, and 800 km by train at 40 km/hr, what is Nikhil's average speed during the entire journey?

1
\(70 {1\over17}\) km/hr
2
\(70 {10\over17}\) km/hr
3
65km/hr
4
72km/hr

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