Ask questions and get helpful answers.
Ask a New Question
  1. Questions
  2. Physics

a train travels the first 30 km of 120 km track with a uniform speed of 30km/h.What should be the speed of train to cover the remaining distance of the track so that its average speed is 60km/h for the entire trip

  1. 👍
  2. 👎
  3. 👁
  4. ℹ️
  5. 🚩
Hitesh
3 answers

  1. Total distance = 120 km
    For an average of 60km/h,
    total time available = 120/60=2 hours

    Distance left = 120-30=90 km
    Time left = 2-1 = 1 hour

    What is the speed need for the remaining distance?

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
    MathMate

  2. avg speed= distance/totaltime
    total time=time1+time2
    = 30km/30km/hr + time2

    avg speed=60=120/total time
    total time=120/60=2h
    30km/30km/hr + time2=2 hr
    time2=1hr
    but speed2=90km/1hr=90 km/hr

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
    👤
    bobpursley

  3. a train normally travel at a uniform speed of 24 km per hour

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
    Sakshi

Answer this Question

Related Questions

  1. Physics

    An open train car, with a mass of 2150 kg, coasts along a horizontal track at the speed 2.29 m/s. The car passes under a loading chute and, as it does so, gravel falls vertically into it for 2.67 s at the rate of 441 kg/s. What is the car's speed after the

  2. Calculus

    A train leaves the station at 10:00 and travels due north at a speed of 100km/h. Another train has been heading due west at 120km/h and reaches the same station at 11:00. At what time were the 2 trains closests?

  3. physics

    In the movie Spiderman 2, there's a famous minute long scene where Spiderman stops a train. If the initial speed of a five car out of control subway train was around the top speed of the NYC subway (27 m/s), and Spiderman stopped the train in exactly one

  4. Math

    Two trains leave the station at the same time, one heading east and the other west. The eastbound train travels 12 miles per hour slower than the westbound train. If the two trains are 400 miles apart after 2 hours, what is the rate of the eastbound train?

  5. Physics

    Light-rail passenger trains that provide transportation within and between cities speed up and slow down with a nearly constant (and quite modest) acceleration. A train travels through a congested part of town at 5.0 m/s. Once free of this area, it speeds

  6. Math

    A train travels 70 feet in 1/10 second. At this same speed, how many feet will it travel in 3 1/2 seconds?

  7. physics

    A train is moving parallel to a highway with a constant speed of 16.0 m/s. A car is traveling in the same direction as the train with a speed of 36.0 m/s. The car horn sounds at a frequency of 504 Hz, and the train whistle sounds at a frequency of 314 Hz.

  8. Physics

    . A train is traveling down a straight track at 20 m/s when the engineer applies the brakes, resulting in an acceleration of -1.0 m/s 2 as long as the train is in motion. How far does the train move during a 40-s time interval starting at the instant the

  9. Physics

    The Speed of train is reduced from 60km/h at the same time as it travels a distance of 450 m, If the reduction in speed is uniform , find how much further it will travel (approx) before coming to rest? Answer is 30m but how? See my solution , i solved it

  10. physics

    An automobile and train move together along parallel paths at 20.3 m/s. The automobile then undergoes a uniform acceleration of −4 m/s2 because of a red light and comes to rest. It remains at rest for 19.4 s, then accelerates back to a speed of 20.3 m/s

Still need help?

You can ask a new question or browse existing questions.