A ship A is moving Westwards with a speed of 10 km h –1 and a ship B 100 km South of A, is moving Northwards with a speed of 10 km h –1 . The time after which the distance between them becomes shortest, is:
A
5 h
B
5 
h
h
C
10 
h
h
D
0 h
Text Solution
Verified by ExpertsThe correct answer is:
A
Given situation is shown in the figure.
Velocity of ship A
towards west
Velocity of ship B
towards north
OP = shortest distance
Relative velocity between 
and 
is
The time after which distance between them equals to 
is given by
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