# Math

posted by .

The time it takes Javier to go to school and his walking rate are inversely proportional. If it takes him 12 mins walking at 3 mph how long does it take if he walks at 4 mph?

• Math -

t = k/r

12 = k/3
k = 36

t = 36/r

when r=4,

t=36/4 = 9 min

## Similar Questions

1. ### algebra

Mason starts walking from home at 3.7 mph. Ema leaves to follow Mason 48 minutes later walking at 4.1 mph. How long will it take Ema to catch up to Mason?
2. ### Math

JJ's boat will go 15 mph in still water. If he can go 12 mph downstream in the same amount of time it takes to go 9 mph upstream, what is the speed of the current?
3. ### math

Can you check my answer to see if i really get this word problem thing A camper leaves the campsite walking due east at a rate of 3.5 mph. Another camper leaves the campsite at the same time but travels due west. In two hours the campers …
4. ### Math

Jane walks one mile from her house to her grandparents’ house. Then she returns home, walking with her grandfather. Her return rate is 70% of her normal walking rate. Let r represent her normal walking rate. a. Write an expression …
5. ### math

tow people begin walking from the same point at the same time. One walks due south at 3 mph and the other walks southeast at 4 mph. Approximately how far apart are the two after one hour walking?
6. ### Math

School is 2 miles from home along a straight road. The table shows your distance from home as you walk home at a constant rate. Time(mins): 10-20-30 Distnce(mi)1.5-1-0.5 1)Is the relationship in the table proportional?
7. ### Math

The time it takes to cover the distance between two cities by car varies inversely with the speed of the car. The trip takes 3 hours for a car moving at 40 mph. How long does the trip take for a car moving at 60 mph?
8. ### Math

If Susie walks 2 mph and Bobby walks 3 mph and the walk from their house is 4 miles, how long does it take for each of them to get there?
9. ### Math

The time T required to drive a fixed distance varies inversely as the speed r. it takes five hours at 60 mph to drive a fixed distance. how long would it take to drive the fixed distance at 40 mph?
10. ### Math

While walking from her house to school, Miriam walks at a pace of 5 km/h. When she walks in the hallways at school, she slows down to 3 ½ km/h. If she spent 2 ½ hours walking to and from school and ¾ of an hour walking in the hallways, …

More Similar Questions