Question

A boat takes 64 minutes less to travel 40 km downstream than to travel the same distance upstream. If the speed of the stream is 5 km/hr, then the speed of the boat in still water is

Answer 1

Answer:

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Answer 2

Answer:

4.5km/hr

Step-by-step explanation:

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