Question

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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Answer 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

Answer 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,

$\: \: \sf \: time = \frac{distance}{speed}$

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,

$\: \: \sf \: average \: speed = \frac{total \: distance}{total \: time}$

Now put on formula

•average speed = 1200/36

•average speed =$\sf33\dfrac{1}{3}$km.

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