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Answer:
average speed of A= 7.5 km / h
time interval for unusing bicycle= 2h 40min
Explanation:
solution is attached
[tex]\rule{300}2[/tex]
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.
[tex]\rule{300}2[/tex]
Extra Information:
Concepts Used:-
[tex]\rule{300}2[/tex]
Also refer to the attachment.