Question

A was travelling from point X to point Y. He increased his speed by 18 km/h after every hour. He reached his destination in 20 hours. If his initial speed was 50 km/h, then what was his average speed in the whole journey?

A 220 km/h
B 211 km/h
C 221 km/h
D 121 km/h
E None of these
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