It took Jen, who biked at a speed of 12 mph, 20 minutes to get home. What is Jim’s speed, if it took him only 15 minutes to bike that distance?

  1. 👍 11
  2. 👎 0
  3. 👁 2,150
  1. distance = speed * time

    Since their distances are the same, if Jim's speed is x, then

    x(1/4) = (12)(1/3)
    x = 16 mi/hr

    Or, you can consider it like this. Jim takes 3/4 as long, so his speed must be 4/3 as great.

    4/3 * 12 = 16

    1. 👍 23
    2. 👎 0
  2. How did you get 1/4 and 1/3 and4/3

    1. 👍 4
    2. 👎 3
  3. the answer its right

    1. 👍 4
    2. 👎 0
  4. Yeah, its right

    1. 👍 3
    2. 👎 0
  5. yes!

    1. 👍 3
    2. 👎 0
  6. very nice!

    1. 👍 2
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. STAT

    Suppose adults in a particular town drive a mean of 65 mph with a standard deviation of 15 mph. Using the normal curve table, a.What percentage of adults drive below 35 mph? b.What percentage of adults drive below 68 mph or above

  2. Pre-Calc/Trig...

    Let y = 4t + 2 be a linear function representing the distance from home for an ant t minutes after starting out from a location near its home. What does the number 4 represent in this function? The ant is 4 feet from its home

  3. Pre-Calculus

    Carmen rides her bicycle at a constant rate to the market. When she rides her bicycle back home along the same route, she bikes at three-quarters the rate she biked to the market. At any given time, t, the distance biked can be

  4. physics

    On a drive from your home to town, you wish to average 52 mph. The distance from your home to town is 106 miles. However, at 53 miles (half way), you find you have averaged only 39 mph. What average speed must you maintain in the

  1. College Algebra

    Jen recently rode her bicycle to visit her friend who lives 12 miles away. On her way there, her average speed was 10 miles per hour faster than on her way home. If Jen spent a total of 1 hour bicycling, find the two rates.

  2. Algebra

    When kevin commuted to work one morning, his average speed was 45 mph. He averaged only 30 mph for the return trip because of an accident on the highway. If the total time for the round trip was 50 min determine the distance

  3. Physics

    Richard is driving home to visit his parents. 130 mi of the trip are on the interstate highway where the speed limit is 65 mph . Normally Richard drives at the speed limit, but today he is running late and decides to take his

  4. physics

    a boy walks to his school at a distance of 6km with constant speed of 2.5 k mph and walks back with a constant sped of 4 k mph. His average speed of round trip expressed in k mph is?

  1. math

    Carl drove from his house to work at an average speed of 35 miles per hour. The drive took him 25 minutes. If the drive home took him 30 minutes and he used the same route in reverse, what was his average speed going home?

  2. college algebra

    A boat can maintain a constant speed of 34 mph relative to the water. The boat makes a trip upstream to a certain point in 21 minutes; the return trip takes 13 minutes. What is the speed of the current?

  3. Algebra

    A plane takes off from an airport and flies east at a speed of 350 mph. Ten minutes later, a second plane takes off from the same airport and flies east at a higher altitude at a speed of 400 mph. How long does it take the the

  4. Calculus

    A race car is running practice laps in preparation for an upcoming race. To judge how the car is performing, the crew takes measurements of the car's speed S(t) (in miles per hour, or mph) every minute. The measurements are given

You can view more similar questions or ask a new question.