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Speed Time Distance

by harsh.champ » Thu Feb 04, 2010 3:22 am
A cargo ship circles a lighthouse at a distance 20 km with speed 1500 km/h. A torpedo launcher fires a missile towards the ship from the lighthouse at the same speed and which moves so that it is always on the line between the lighthouse and the ship. How long does it take to hit?

(1)37.7 secs
(2)56.57 secs
(3)75.43 secs
(4)94.29 secs
(5)113.14 secs


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Is there any shortcut method to quickly solve the question??
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by ajith » Thu Feb 04, 2010 5:21 am
harsh.champ wrote:A cargo ship circles a lighthouse at a distance 20 km with speed 1500 km/h. A torpedo launcher fires a missile towards the ship from the lighthouse at the same speed and which moves so that it is always on the line between the lighthouse and the ship. How long does it take to hit?

(1)37.7 secs
(2)56.57 secs
(3)75.43 secs
(4)94.29 secs
(5)113.14 secs


________________________
Is there any shortcut method to quickly solve the question??
Well, I do not think GMAT tests your advanced maths skills. Hence I do not think we will see anything like this in GMAT
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