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1/3 of a certain journey is covered at the rate of 25 km/h , 1/4 at the rate of 30 km/h and the rest of 50 km/h.What is the averag

By Serenity

1/3 of a certain journey is covered at the rate of 25 km/h , 1/4 at the rate of 30 km/h and the rest of 50 km/h.What is the average speed for the
whole journey?

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Serenity

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4. What same no, must be added to each term of the ratio 7:3 so that the ratio become 2:3?
(a) 1
(b) 2
(c)

which electrons are responsible for the chemical properties of an atom​

2 thoughts on “1/3 of a certain journey is covered at the rate of 25 km/h , 1/4 at the rate of 30 km/h and the rest of 50 km/h.What is the averag”

  1. Total time taken

    =400/25+300/30+500/50

    16+10+10=36
    hours

    Average speed = Total distance/Total time

    =1200/36=33 1/3 km/hr

    Reply

  2. Given:

    • 1/3 of certain journey is covered in 25 km/h.
    • 1/4 at the rate of 30km/h.
    • the rest of 50km/h.

    To Find:

    • Average speed for the whole journey.

    Solution:

    Let the total distance be 1200km

    As we know,

    [tex] \: \: \sf \: time = \frac{distance}{speed} [/tex]

    Now put on formula

    Total time taken

    =400/25 + 300/30 + 500/50

    =16 +10 + 10 = 36 hours

    Now,find average speed

    As we know,

    [tex] \: \: \sf \: average \: speed = \frac{total \: distance}{total \: time} [/tex]

    Now put on formula

    •average speed = 1200/36

    •average speed =[tex]\sf33\dfrac{1}{3}[/tex]km.

    ______________________________________

    Reply

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