Question

A cyclist travels at a speed of 25 km/h over a certain distance and then returns over the same distance at a speed
of 15 km/h. What is his speed for the total Journey​

Answer 1

Answer:

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Class 11

>>Applied Mathematics

>>Numerical Applications

>>Time and distance

>>a man travels at a speed of...

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a man travels at a speed of 20 km/hr. and then returns at a speedof 30 km/hr. his average speed of whole journey is

A

25km/hr

B

24.5 km/hr

Your Answer

C

24 km/hr

Correct Answer

D

25.5 km/hr

Hard

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Solution

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Correct option is

C

24 km/hr

Given,

A man trads at a speed V

1

=20Km/h of distance x.

and Same distance x with v

2

=30 km/h

Let the time travel from speed

v

1

=

20

x

(speed = dist/time)

where x is the constant distance.

Total distance travelled =2x.

Now,

Avg. speed = Total distance travelled/ Total time taken

⇒

30

x

+

20

x

2x

=

5x

2x×60

=24 kmthr