Arthur D. answered • 11/17/14

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d=rt

300=rt where r=rate of the car

2000=(r+340)t where (r+340)=rate of the plane

300/r=t

2000/(r+340)=t

2000/(r+340)=300/r because both are equal to t

cross multiply

2000*r=300*(r+340)

2000r=300r+102,000

2000r-300r=102,000

1700r=102,000

r=102,000/1700

r=60 km/hr is the rate of the car