A car travels with the speed of 30 km h-1 for 30 minutes and then with a speed of 40 km h-1 for one hour.
Find:
1) The total distance travelled by the car.
2) The total time of travel, and
3) The average speed of car
Answers
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Explanation:
Speed of car for first 30 minutes = 30 km h-¹
Speed of car for next 1 hour = 40 km 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
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
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