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152/65=2.33 hours =2 hours 19.8 minutes
If you travel at 60 mph, it would take 2 and a half hours. If you travel at 65 mph, it would take 2 hours and 18 minutes.
Estimating one of them is equivalent to estimating the other.
No, it is not. Estimating may be rounding but need not be.
The estimated answer for 308 would be 300. When estimating, you round the number to the nearest place value you are estimating for. In this case, we are estimating to the nearest hundred, so we look at the hundreds place digit (3) and drop the tens and ones digits. Therefore, the estimated answer for 308 is 300.