By selling a bicycle for ₹13,000, a man gains of its cost price. 1/4 of its cost price
Find the cost price.
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All waves, including sound waves and electromagnetic waves, follow this equation. It should be noted that some particular waves have their own specific speeds:
the speed of light and all of the electromagnetic spectrum in a vacuum (in vacuo) is 300,000,000 m/s or 3×108 m/s
the speed of sound in air is 340 m/s
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