Explanation & Calculation
- The time it would have taken by Queen Mary is
TQM=3D10H40M+0D10H2M=3D20H42M
- Before, going any further it is needed to express all the given times in hours to match the units of the speed (km/h ).
- Then,
TL−USTQM=3D10H40M=(3×24h)+(10h)+(6040h)=3248h=3D10h42M=(3×24h)+(10h)+(6042h)=10827h
- The length between New York and Cornwell can be calculated by the details given for the Liner US.
d=UL−US×TL−US=65.5km/h×3248h
- Then the average speed of Queen Mary is
VQM=timedistance=10827h65.5km/h×3248h=65.47km/h
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