300 മീ. ദൂരം 20 സെക്കൻഡുകൊണ്ട് യാത്രചെയ്യുന്ന വാഹനത്തിൻറ വേഗം?
A20 km/hr
B38 km/hr
C54 km/hr
D70 km/hr
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