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The airspeed indicator of a plane headed...

The airspeed indicator of a plane headed due north, indicates that it is moving through the air at 240 km/h. If there is a wind of 100 km/h from west to east, the velocity of the airplane relative to earth is :

A

218 km/h

B

260 km/h

C

250 km/h

D

230 km/h

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