a car travels with a speed of 30 km /hr for 30 minute and then with speed 40 km /hr for one hour find :
{a} the total distance travelled by the car
{b} the total time of travel
{c} the average speed of car
Answers
Explanation:

Primary School
Physics
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A car travels with speed 30 km/h for 30 min and then with speed 40 km/h for 1 h. find: a)total distance travelled by the car b)the total time of travel,and c) the average speed of car
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by Razigreat20.07.2018
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anish1750
Helping Hand
In 30 min the car travelled 15km. And the last 1 hour it travelled 40 km. so it totally travelled (40+15=55) 55km
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santy2
Ace
Answer:
The total distance is 55 km, the total time is 1.5 hours and the average speed is 36.67 km/h
Explanation:
Step 1 : Write down the relevant formulas :
Distance = Speed × Time
Average speed = Total distance / Total time.
Step 2 : Solve the questions.
1) Total distance = Distance traveled at 30 km/h in 30 minutes + Distance traveled for 1 hr at 40 km/h
Distance traveled at 30 km/h = 30 × 0.5 = 15 km
Distance traveled at 40 km/h = 40 × 1 = 40 km
Total distance = 40 km + 15 km = 55 km
2) Total time = time taken in the first part of the journey + time taken in the second part of the journey
= 0.5 + 1 = 1.5 hours
3) Average speed = Total distance / Total time.
This is given by :
= 55/1.5 = 36.67 km/h
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Answer:
Speed of car for first 30 minutes = 30 km h^{-1}h
−1
Speed of car for next 1 hour = 40 km h^{-1}h
−1
(a) total distance travelled by the car
First case
Speed = distance / time
distance = speed x time
= 30 x 0.5 ---- (30 min = 0.5 hour)
= 15 km ---- (i)
Second case
speed = 40 km h^{-1}h
−1
distance = 40 km x 1
= 40 km ---- (ii)
Adding (i) and (ii)
Total distance = 15 km + 40 km
= 55 km
(b) total time of travel = 0.5 hr + 1.0 hr = 1.5 hr
(c) average speed = total distance travelled/total time taken
= 5.5 km/ 1.5 hr
= 36.67 km h^{-1}h