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) 5h
(b) 5√2h
(c) 10√2h
(d) 0h
Correct option (a) 5 h
Explanation:
