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Train Traveling at a Constant Rate for an Hour

GMAT-1PRWQL

If a train travels at a constant rate of $30$ meters per second, how many kilometers does it travel in $1$ hour? (1 kilometer = 1000 meters)

A

$30$ km

B

$60$ km

C

$108$ km

D

$33.3$ km

E

$25$ km