Velocity of boat in still water is 13m/s. If water flows in river with a velocity 5m/s. What is the difference in time taken by him
to cross the river in the shortest path and in the shortest time. If width of the river is 156m.
(A) 1 sec
(B) 13 sec
(C) 13
sec
va se
(D) 3sec
Answers
Answered by
0
Explanation:
Shortest path taken by boat when he flow perpendicular to river with respect to river flow as shown in the fig
t
1
=
156
12
=
13
s
e
c
shortest time when he move perpendicular
t
2
=
156
13
=
12
s
e
c
⇒
d
i
f
f
e
n
r
e
n
c
e
=
t
1
−
t
2
=
13
−
12
=
1
s
e
c
Hence the A option is correct.
Answered by
0
Answer:
Shortest path taken by boat when he flow perpendicular to river with respect to river flow as shown in the fig
t
1
=
12
156
=13sec
shortest time when he move perpendicular
t
2
=
13
156
=12sec
⇒diffenrence=t
1
−t
2
=13−12=1sec
Hence the A option is correct.
Explanation:
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