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Q.

Set the drifts suffered by boat in increasing order.
a) d = 1000 m VR = 2 m/s Vb = 4 m/s
b) d = 500 m VR = 1 m/s Vb = 6 m/s
c) d = 1000 m VR = 6 m/s Vb = 6 m/s
( d → width of river VR → velocity of river Vb → velocity of Boat). The boat moves perpendicular to width of the river.

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a

a, b, c

b

b, c, a

c

b, a, c

d

c, b, a

answer is C.

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Detailed Solution

 Drift = width  boat speed × river speed 

da=10004×2=10002 m

db=10006×1=10006 m

dc=10006×6=10001 m

db<da<dc

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