Isaac's family drove 100 miles to Yakima on Friday and then they drove back home on Sunday. On the way to Yakima their average speed was 10 mph faster than on their return trip. (Hint: See problem 29 on page 497.)

a) If we represent their rate on their way to Yakima by x, write an expression to show the time spent driving to Yakima.
b) If we represent their rate on their way to Yakima by x, write an expression to show the time spent driving home from Yakima.
c) Write a simplified expression to represent how much longer it took them to drive home

Question

Isaac's family drove 100 miles to Yakima on Friday and then they drove back home on Sunday.  On the way to Yakima their average speed was 10 mph faster than on their return trip.  (Hint:  See problem 29 on page 497.)

a)  If we represent their rate on their way to Yakima by x, write an expression to show the time spent driving to Yakima.
b)  If we represent their rate on their way to Yakima by x, write an expression to show the time spent driving home from Yakima. 
c)  Write a simplified expression to represent how much longer it took them to drive home

misty1212 · Answer

HI!!

misty1212 · Answer

since time is distance divided by rate, if the rate going it $x$ then the time going is $\frac{100}{x}$