21. The following table shows the distance covered by 3 cars A, B and C between 10.00 am to 10. 20 am.
Time
Distance covered
In Km
spee
t
10.00 am
0
0
10.05 am
6
8
S
10.10 am
15
16
15
10.15 am
25
24
26
10.20 am
45
32
40
Answers
Answer:
Ncert solutions
Grade 7
Mathematics
Science
Chapters in NCERT Solutions - Science , Class 7
Exercises in Motion and Time
Question 5
Q5) The odometer of a car reads 57321.0 km when the clock shows the time 08:30 AM.
What is the distance moved by car, if at 08:50 AM, the odometer reading has changed to 57336.0 km?
Calculate the speed of the car in km/min during this time. Express the speed in km/h also.
Solution:
The initial reading of the odometer of the car =57321.0 km
The final reading of the odometer of the car = 57336.0 km
The car starts at 8:30 AM and stops at 8:50 AM.
Distance covered by car = (57336 - 57321) km = 15 km
Time taken between 08:30 AM to 08:50 AM = 20 minutes = 20/60 hour = 1/3 hour
So Speed in km/min
Speed = (Distance travelled)/ (Time)
= (15km)/ (20min)
= 0.75km/min
Speed in km/h Speed = (Distance travelled)/ (Time)
= (15km)/ (1/3h)
= (15 x 3) km/ (1h)
= 45km/h
Explanation:
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