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Some Basic Concepts Of Chemistry

Question
CBSEENCH11004979

A train covers a distance of 144 kilometers in two hours. What is the speed of the train in m/s.

Solution

Distance covered  = 144 kilometers
                           = 144 x 1000 m
Time taken = 2 hours  = 2 x 60 x 60 second
therefore Speed space equals fraction numerator Distance space covered over denominator Time space taken end fraction equals fraction numerator 144 cross times 1000 straight m over denominator 2 space cross times 60 cross times 60 straight s end fraction equals space 20 space ms to the power of negative 1 end exponent