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2 problems match “work and time”. Clear

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1. Return speed on a round trip ●●○○○ 20 ptsA car travels the 120 miles from $A$ to $B$ at 60 miles per hour, and then returns to $A$ on the same road. If the average rate of the round trip is 45 miles per hour, what is the rate, in miles per hour, of the car traveling back from $B$ to $A$?
2. Widget output difference on two days ●●○○○ 20 ptsOn Monday, David produces $w$ widgets per hour and works for $t$ hours. On Tuesday, he works for $2$ fewer hours than on Monday, but produces $4$ additional widgets per hour. If $w = 2t$, how many more widgets did David produce on Monday than on Tuesday?