Question

the speed of a boat in still water 9 km/h and a speed of a stream is 2km /h find the time take by the boat to go 14 kn upstream​

Answer 1

Speed of boat =9 km/hr

Speed of stream =x km/hr

Speed of boat downstream = speed of boat + Speed of stream

=(9+x) km/hr

Distance covered by boat in 4 hrs upstream =54 km

Speed of boat upstream (9+x)=

4

54

=13

2

1

x=13

2

1

−9 km/hr=4.5 km/hr

Answer 2

Answer:

2 hours because the speed of boat is 9 water speed is 2 so 9-2=7 7kmph so two hours