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A parachutist,before he opens his parachute,falls for a time t1,and covers a distance of 5t1^2 and after he opens his parachute he falls for a time t2 and covers a distance Vt2.V is the velocity attained just before the parachute is opened and is given by 5t1.After what time did he open the parachute,if the total distance covered by the parachutist is 1500m and the total time is 30 seconds?
a)10 seconds b)20 seconds c)18 seconds d)12 seconds

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Gate Other Question
A man started 15 minutes late and by travelling at a speed which is 5/4rth of his usual speed reached his office 20 mins early. What is the usual time of the journey?
a)85mins b)100 mins c)135 mins d)175 mins
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