A car completes a journey in 10 hours. If it covers half of the journey at 40 kmph and the remaining half at 60 kmph, the distance covered by car is
A400 km
B480 km
C380 km
D300 km
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ഒരാൾ A-യിൽ നിന്ന് B-യിലേക്ക് 40 km/hr വേഗത്തിലും B-യിൽ നിന്ന് A-യിലേക്ക് 60 km/hr വേഗത്തിലും സഞ്ചരിച്ചു. എങ്കിൽ ശരാശരി വേഗം ?