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## Theory : Boat and Stream

Important Concepts & Tricks – Boat and Stream Up Stream – It means the boat is moving against the direction of the stream. Down Stream – It means the boat is moving in the direction of the stream. Note- Stream means current i.e. the speed of water....

## Problems on Train

Important Tips and Formulas Time taken to cross a man or pole – Length of Train / Speed of Train Time taken to cross a Platform – Length of (Train + platform) to Speed of Train Time taken to cross a Bridge – Length of (Train + platform) to Speed of Train... ## Theory: Time and Distance

Important Facts and Formulas ( Time and Distance ) Speed = (Distance / Time) Distance = Time × Speed Time = Distance / Speed When we need to change x km/hr to m/sec, then multiply it by 5/18 x km/hr = (5 × x)/18 m/sec When we need to change x m/sec to km/hr, then... ## Important Notes on Simple Interest

SIMPLE INTEREST Principal – The money which is borrowed or lent for a certain period of time is called Principal or the Sum. Interest – The extra money which is paid along with the principal. Amount = Principal + Interest Simple Interest – If the interest is reckoned...