A car travels with a speed of 30km/h for 30 minutes and then with 40 km/h for 1 hour. Find (i) the total distance travelled by the car ii)Average speed of car.
Answers
Answered by
14
distance is equal to speed into time
so distance 1= 30×30/60(converting minutes to hrs) =15 km
distance 2=40×1=40km
total distance is 15+40=55km ans
average speed is total distance/total time=55/1.5 = 36.66 minutes
Hope this helps
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Answered by
39
Explanation:
ANSWER:-
(i) To find the Total Distance,
We need to remember the formula
- And also, maintain the SI units, detailed explanation below.
As we can see, we need to convert the units.
As of first case:-
If I take the final value in Kilometres, then I need to convert 30 minutes in hour.
Now, calculating distance:-
Final distance as of first case is 15 Km.
Second case:-
Distance = 40×1 ( Units stable)
Distance = 40 km.
Total distance = 40+15
= 55 km/ hour.
(ii) To find the average speed:-
( 3/2 came after adding 1+1/2)
Average speed = 36.6 km/ hour.(approx.)
Things to Remember:-
- In general cases only:-
- Always convert the units into SI units.
- SI Unit of speed is m/s
- SI unit of Distance is metre
- SI unit of time is second.
- Now as here majority was in Kilometre per hour, so I chose not to convert it rather keep it simple and converted only one unit above.
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