FIVE Hanayama chess puzzles in 60 seconds #shorts

A train passes a 60 metres long platform in 20 seconds and a man standing on the platform in 16 seconds. The speed of the train is:

A train passes two bridges of lengths 800 m and 400 m in 100 seconds and 60 seconds respectively. The length of the train is:

A train passes two bridges of lengths 800 m and 400 m in 100 seconds and 60 seconds respectively. The length of the train is :

Solve Any Calculus Problem in Just 20 Seconds | Maths Short Tricks For JEE Mains 2020

If sec theta=-13/12 and theta lies in the second quadrant then find the values of all the other five trigonometric functions

If cottheta=-(12)/(5) and theta lies in the second quadrant,find the values of the other five functions.