input question: To make it easier to remove bolts from a bike, you can

output answer: Spray them down with WD-40 to make it easier to remove them

input question: How to clean a curling iron.

output answer: Rub steel wool over the barrel of the iron.

input question: how to calculate miles to kilometers

output answer:
Converting a mile length measurement to a kilometer measurement involves multiplying the length by the conversion ratio to find the result. One mile is equal to 1.609344 kilometers, so to convert simply multiply by 1.609344.