Cheryl has a cup of hot chocolate with steam what all is matter

17 a tourist was planning a trip by car for travelling at some constant speed for 2.5 hours. however, he found that if he increases the speed by 20 km/h he can cover the same distance in 30 minutes less time than it was planned. what was the planned speed of the tourist, in km/h?

Where is my favorite place to eat?

Blank is the amount of energy in a sound wave per unit of time and is also related to the loudness of a sound