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What is the time taken by a boat to travel 120km upstream and back to the starting point if the speed of the boat is 25 km/hr, and the speed of stream is 5km/hr?

A8 hours

B12 hours

C14 hours

D10 hours

Answer:

D. 10 hours

Read Explanation:

SpeedofBoat=25km/hr</p><pstyle="color:rgb(0,0,0);margintop:2px;marginbottom:2px"datapxy="true">Speed of Boat = 25 km/hr</p><p style="color: rgb(0,0,0); margin-top: 2px; margin-bottom: 2px" data-pxy="true"> Speed of Stream = 5 km/hr

Distance=120km</p><pstyle="color:rgb(0,0,0);margintop:2px;marginbottom:2px"datapxy="true">Distance = 120 km</p><p style="color: rgb(0,0,0); margin-top: 2px; margin-bottom: 2px" data-pxy="true">Time Taken to Cover 120km Distance upstream and Downstream is,

=120(255)+120(25+5)=\frac{120}{(25-5)}+\frac{120}{(25+5)}

=12020+12030=\frac{120}{20}+\frac{120}{30}

=6+4=6+4

=10hours=10hours


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