ssc Maths Puzzle Numerical Ability Number System

What is the greatest number
sqrt 5, sqrt 7, sqrt 16, sqrt 8. Arrange it ascending order

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ssc Other Question

A train start running from station A,if made an accident after travelling 150 km.After accident the speed train reduces by 5/6 of the previous speed,so it reach 15 minute late at station B.Had the accident taken place 30 km further it have been 7 minutes late .find the speed of the train and distance between A & B station. If 73+46=42,
95+87=57, than
62+80=?