Calculus Level pending

A 17m ladder is resting against a wall . The bottom is initially 10 m away from the wall and is being pushed towards the wall at rate of $$\frac{1}{5}$$m/s . How fast is the top of the ladder moving up the wall after 15 seconds we start pushing .

Give answer as $$\lfloor1000 \text{rate at which top of ladder is moving up ahter 15 sec } \rfloor$$

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