Question

A ship anchored in a port has a ladder which
hangs over the side. The length of the ladder
is 200cm, the distance between each rung in
20cm and the bottom rung touches the water.
The tide rises at a rate of 10cm an hour.
When will the water reach the fifth rung?

Answer 1

Answer:

8 hours

Step-by-step explanation:

The length of the ladder is 200cm ;

Each rung is 20cm long, so the number of rungs are

200 ÷ 20 = 10 (rungs)

Because fifth rung is a half of ladder and 200 ÷ 2 = 100 cm ,

we have to find out when the water reaches 100cm mark.

The tide rises at a rate of 10 cm an hour

10t = 100 ,

If the distance between each rung is 20cm and the bottom rung touches the water , then length of ladder is 80 cm

10t = 80

t = 8 hours

Tide takes 8 hours to reach at fifth level.