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Question
Express 15 m s-1 in km h-1.
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Solution
1 metre = `1/1000` km
15 metre = `15/1000` km
1 second = `1/3600` hr
Here , Distance = `15/1000` km
Time taken = `1/3600` hr .
Speed = `"Distance"/ "Time taken" `
= `(15/1000)/(1/3600)`
= `15/1000 × 3600/1`
= 54 km `"h"^-1`
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