Question

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Answer 1

Answer:

average speed of A= 7.5 km / h

time interval for unusing bicycle= 2h 40min

Explanation:

solution is attached

Answer 2

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Your Answer:

Let XY be the path of 4km.

Where X is the position of A and B. And Y be the position of Camp.

ATQ,

A started to walk (5km/hr)

At the half of the path(20km)

He had taken 20/5 = 4hrs.

And after half of the Track he used bicycle (15km/hr).So, he had taken 20/15 = 1.3hrs

So, total journey time

=(4+1.3)hrs

=5.3hrs

Now Coming to the Questions.

30) The Average speed of tourist A for the 40km trip is

Sol.

Average Speed of A

= total distance / total time

= 40km/5.3hrs

= 7.54 km/hrs

So, option B is correct answer of the first Question.

31)How long was the bicycle left unused.

Sol.

Now the total time of bicycle that is unused.

= (4 - 1.3)hrs

= 2.7 hrs

= 2 hrs 40 mins

So, option A is correct answer of second Question.

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Extra Information:

Concepts Used:-

• Average Speed
• Time And Distance
• Mathmateical Solvings and Operations.

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Also refer to the attachment.