A Colony of Bacteria Is Growing at a Rate Proportional $10 ^ { 3 }$

Short Answer

A colony of bacteria is growing at a rate proportional to the number of bacteria present. At the beginning of an experiment there were about $10 ^ { 3 }$ bacteria present. In two hours, the count rose to $3 \times 10 ^ { 3 }$ bacteria. At what time will there be 6 × $10 ^ { 3 }$ bacteria present?
Enter just a real number rounded up to one decimal place (no units).