Jennifer travels first 4 hours of her journey at a speed of 80 miles/hr and the remaining distance in 6 hours at a speed of 30 miles/hr. Wh…

travel in 4 hours = 320 miles

and

travel in 6 hours = 180 miles

total travel = 500 miles

and total time = 10 hours

so ,average speed = 50 miles / hour

which is required ans

50 miles / hr

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