A car travels with speed 30 km/h for 30 minute and then with speed 40 km/h for one hour. Find :(a) the total time of travel (b) the average speed of car and (c) the total distance travelled by the car.
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Answer:
The first term of a sequence is 22. the term to term rule is divided by 2 and subtract by 3. show that the first term in this sequence which is a negative number is -2 1/2
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Solution:
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
−1
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