Question

How much less distance is to be covered now in going through the tunnel than on going over the hilly road (a) 10km (b) 15km (c) 5km (d) 25km​

Answer 1

$\rm\huge\underline{Answer}$

the branch of science concerned with the substances of which matter is composed, the investigation of their properties and reactions, and the use of such reactions to form new substances.