A man riding on a bicycle at a speed of 17 km/h crosses a bridge in 42 minutes. Find the length of the bridge?
A7.3 km
B17.4 km
C3.8 km
D11.9 km
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ഒരു വസ്തു 4 സെക്കന്റിൽ 30 മീ, സഞ്ചരിക്കുന്നു. തുടർന്ന് 6 സെക്കന്റിൽ മറ്റൊരു 70 മീ. സഞ്ചരിക്കുന്നു. വസ്തുവിന്റെ ശരാശരി വേഗത എന്താണ്?