The speed of a motor boat is that of the current of water as 30 : 5. The boat goes along with the current in 5 h 10 min. It will come back in	Choose one:
A) 5 hour 15 minutes
B) 6 hour
C) 6 hour 50 minutes
D) 12 hour 10 minutes
E) 8 hour
Let speed of motor boat is 30x and Current is 5X.   Speed of the boat along with current = 30X + 5X = 35X.   Given Time 30  + 5= 
<gadget id="calculator">30  + 5</gadget>
<output>35</output>
35X.   Given Time= 5h 10 min = 310/60 = 31/6 h.   Distance = (32/6) * 35X = 180.83X . . . . . (1)   Speed of the Boat in coming back = 30X - 5X = 25X.   Let time taken is T.   Now,   Distance 30  - 5= 
<gadget id="calculator">30  - 5</gadget>
<output>25</output>
25X.   Let time taken is T.   Now,   Distance= 25X *T   180.83X = 25X * T   T = 7.21 hours.   Note: If given ratio is 36:5 then answer would be 6 hours 50 minutes.   answer :6 hour 50 minutes
<result>C</result>
The speed of a motor boat is that of the current of water as 30 : 5. The boat goes along with the current in 5 h 10 min. It will come back in