How to detect an acid / base?

ACID

Litmus Test- Blue litmus paper turns red in acidic medium.pH test- Dip a pH paper into the solution. And check for the corresponding values on the pH scale for the colours that appear. If the value is below 7, its acidic

BASE

Litmus Test- red litmus paper turns blue in basic medium.pH test - Dip a pH paper into the solution. And check for the corresponding values on the pH scale for the colours that appear,if it's above 7, it's basic.

Answer(b) 60 miles per hour;