The speed of the boat in still water in 12 kmph. It can travel downstream through 45 kms in 3 hrs. In what time would it cover the same distance upstream?
Choose the correct answer:
A) 6 hours
B) 5 hours
C) 9 hours
D) 15 hours
E) 23 hours
Speed of the boat in still water = 12 km/hr   Speed downstream = 45⁄3 = 15 km/hr   Speed of the stream = 15-12= 
<gadget id="calculator">15-12</gadget>
<output>3</output>
3 km/hr   Speed upstream= 12-3= 
<gadget id="calculator">12-3</gadget>
<output>9</output>
9 km/hr   Answer is 5 hours   Time taken to cover 45 km upstream= 45⁄9 = 5 hours
<result>B</result>
The speed of the boat in still water in 12 kmph. It can travel downstream through 45 kms in 3 hrs. In what time would it cover the same distance upstream?