alleryஒரு காரின் வேகத்தை 5 km/h அதிகரித்தால், அது 60 km பாதையை 1 மணிநேரம் முன்னதாகவே முடிக்க முடிகிறது. அதன் அசல் வேகம் என்னவாக இருந்தது?
A12 km/h
B15 km/h
C10 km/h
D20 km/h
Answer & Solution
Correct answer: B. 15 km/h
60/s - 60/(s+5) = 1 என்பது s(s+5) = 300 எனத் தருகிறது, எனவே s = 15 km/h.
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