Question

a motor boat whose speed is 18km/hr in still water takes 1 hour more to go upstream than return downstream to the same spot find the speed of the stream
​

Answer 1

Step-by-step explanation:

tan30=

CD

AC

=>

CD

AC

=

3

1

=>LetAC=x,CD=x

3

AE=AC+CE=x+25

sin45=

2

1

=

AB

AE

=>

75

x+25

=

2

1

=> x=

2

75

2

−50

=27.85m

=> AC=27.85m,CD=48.18m

AD=

AC

2

+CD

2

=55.67m = lenght of string of second boy

solution