Answer:
After 6 hours there will be more than 140 people, but after 5 hours there will be exactly 140 people. I don't know if this question is meant to trick you or not.
Step-by-step explanation:
To find out, 70 - 42 = 28, 140/28 = 5 after 5 hours
70(5) - 42(5) = 350 - 210 = 140
But the question asks when will there be MORE than 140 people, after 5 hours there will be 140 people, and 140 > 140 is not true, so its after 6 hours
