Question

Mining is the extraction of valuable minerals or other
geological materials from the Earth. A miner takes 1.5 hours
mine a gold ore while it takes him twice the time to mine a
diamond ore. Same miner digs out ruby in 30 mins less than
the time taken for diamond. How much time does it take th
miner to mine a rubu and a gold ore?​

Answer 1

Answer:

Ore is a deposit in Earth’s crust of one or more valuable minerals. The most valuable ore deposits contain metals crucial to industry and trade, like copper, gold, and iron.

GRADES

3 - 12+

CONTENTS

5 Images

Answer 2

Answer:

4 hours

Explanation:

Gold = 1.5 hrs

diamond = 2*gold = 3hrs

ruby = diamond-30min = diamond-½hr = 2.5 hrs

Gold+ruby = 1.5+2.5 = 4hrs