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  1. Two cars start at the same time from one point and move along two roads at right angles to each other. Their speeds are 36 km/ hour and 48 km/hour respectively. After 15 seconds the distance between them will be
    1. 400 m
    2. 150 m
    3. 300 m
    4. 250 m
Correct Option: D


Let O be the starting point. The car running at 36 kmph is moving along OB and that at 48 kmph moving along OA. Also let they reach at B and A respectively after 15 seconds.

∴   OA = 48 ×
5
× 15 = 200 m
18

∴   and OB = 36 ×
5
× 15 = 150 m
18

∴  Required distance = AB
= √(200)2 + (150)2
W (By Pythagoras theorem)
= √40000 + 22500
= √62500
= 250 m


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