MATHS SIGHT NCERT BOOK
CLASS 8
CH 6 LINEAR EQUATIONS IN ONE VARIABLES
EX 6.2
8. A motorboat covers a distance upstream in 6 hours and covers the same distance downstream in 5 hours . If the speed of water is 3 km/h , then find the speed of the boat in still water?
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Answer:
Let velocity in still water be S
Velocity of water be W
distance to be covered be D
D=6(S+W)
D=10(S−W)
which gives S=4W
So, D=7.5hrs.