Question

Aman takes 2 hours to bike from point 'M' to point 'N' at a speed of 25 km/h. He then increases his speed by 80% and takes 3 hours to reach point 'O' from 'N'. What is Aman's average speed from point 'M' to 'O'?

A 27 km/h
B 67 km/h
C 37 km/h
D 55 km/h
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