19. A motorcyclist takes 1 h 25 minutes to ride from
his home to his friend's house with a uniform
speed of 45 km/h. What is the distance between
his house and his friend's house?
20. The maximum speed of a bus is 100 km/h. If it
takes 8 hours to cover a trip of length 500 km,
what is the ratio of its maximum speed to its
average speed?
21. Zafar starts running along a circular path of
radius 100 m for his morning exercise. What is his
average velocity at the end of one lap if he takes
5 minutes to complete one lap?
Answers
The distance of friend's house is 27.5 km.
Step-by-step explanation:
Given : A motorcycle driving at 55 km/h takes 30 minutes to arrive at his friend's house (from his own).
To find : How far is his friend's house?
Solution :
Speed is 55 km/hr.
Time is 30 minutes.
Convert minutes into hour,
1 minute = hour.
30 minutes = hour
30 minutes = 0.5 hour
The distance formula is given by,
Therefore, the distance of friend's house is 27.5 km.
#Learn more
Rahul takes 45 minutes from his house to reach his school on his motorcycle of the motorcycle
has a speed of 7.5 m/s, calculate the distance between his house and the school
A) 20.25 km
(8) 40.5 km
(C) 81 km
(D) none of these
Maximum speed of a bus
:- 100 kilometer per hour
8 hours to cover a trip of length 500 km
Average speed :- 500/8 = 62.5
Ratio of maximum speed to average speed:-
100 : 62.5
200: 125
8 : 5
Radius of lap = 100m
Circumference =2πR=200π=628m
time taken to cover one lap = 62.8s
Hence average speed =
62.8
628
=10ms
−1
Average velocity = 0 as the inital and final positions are same (after completing a lap) (displacement = 0)
It is of science not of maths go and ask there.