താഴേക്ക് ഓടുന്ന ഒരു ബോട്ട് 16 കിലോമീറ്റർ ദൂരം 2 മണിക്കൂർ കൊണ്ട് താണ്ടുന്നു, അതേ ദൂരം മുകളിലേക്ക് കയറാൻ 4 മണിക്കൂർ എടുക്കും. നിശ്ചലമായ വെള്ളത്തിൽ ബോട്ടിന്റെ വേഗത എത്രയാണ്?
A4 km/hr
B6 km/hr
C8 km/hr
D10 km/hr
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