നിശ്ചലമായ വെള്ളത്തിൽ മണിക്കൂറിൽ 20 km വേഗതയിൽ സഞ്ചരിക്കുന്ന മോട്ടോർ ബോട്ട് 30 km താഴേക്ക് പോയി മൊത്തം 4 മണിക്കൂറിനുള്ളിൽ തിരിച്ചെത്തുന്നു.സ്ട്രീമിന്റെ വേഗത?
A8.5
B10
C11
Dനൽകിയിരിക്കുന്ന ഡാറ്റ ഉപയോഗിച്ച് കണക്കാക്കാൻ കഴിയില്ല
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