Beta, pehle 72 km/h nu 1000 se multiply karke metre bana lo, phir 3600 (seconds in an hour) se divide kar do. Jawab aayega 20 m/s. Par mere liye, ye sirf class 7 ka sawaal nahi hai... main sochta hoon ke meri school ki bus kaunsi raftar se chalti hai, kyunki uske diesel ka kharcha hi toh mere pitaji ke tractor wale diesel se joda hai. Dono ka hisaab ek jaise lagta hai, bus aur tractor ka, aur paise dono hi chheen ke le jaate hain.
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