All ladders shall be installed so far as practicable at an angle not greater than ______________ from the horizontal and shall have substantial and adequate landing platform for every __________ vertical distance from each other.

• A. 60 degrees; 6 meters
• B. 70 degrees; 9 meters
• C. 75 degrees; 8 meters
• D. 65 degrees; 12 meters

Answer: (B)

Safe ladder use hinges on two practical ideas: keep the ladder at a reasonably shallow incline and provide resting platforms at regular vertical intervals. Setting the angle not to exceed 70 degrees from the horizontal makes the ladder more stable and less prone to tipping or sliding out from under the worker. If the ladder were steeper, slippage and loss of balance become bigger risks; if it were too shallow, you’d fight poor footing and awkward climbs.

The requirement for a substantial landing platform after every 9 meters of vertical rise ensures there’s a safe place to rest, regain balance, and prepare to continue climbing. It limits how far a fall could go without a chance to recover and provides a secure transition point between ladder segments.

So, the combination of a maximum angle of 70 degrees and platforms every 9 meters aligns with the standard safety practice, which is why that option is the correct one. The other numbers don’t fit this established spacing and angle guideline.