Question

Enough of IIM and IAS Questions.. Now an IIT Question !!
A ladder hangs over the side of a ship anchored in a port.
The bottom rung touches the water.
The distance between rungs is 20 cm and the length of the ladder is 180 cm.
The tide is rising at the rate of 15 cm each hour.
When will the water reach the seventh rung from the top?

Answer 1

Answer:

After 8 hours

Explanation:

If the first rung is already in the water then there are 6 more rungs before the water hits the seventh rung. This means a total distance of 120cm from where the water is to the seventh rung. If the water rises 15cm every hour and it has to rise 120cm then you need to divide the distance by speed to get time

(time =d/s)

So the amount of time = 120/15

= 8 hours

Putting it back into context, it will take 8 hours for the water to reach the seventh rung of the ladder