A car travels for 1.5 hours. For the first 20 minutes it travels at an average speed of 78 km/h and for the remaining 70 minutes it travels at an average speed of 60km/h. Calculate
(a) the total distance travelled by the car. (b) the average speed of the car for the whole journey
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Step-by-step explanation:
Did you mean: A car travels for 1.5 hours. For the first 20 minutes it travels at an average speed of 78 km/h and for the remaining 70 minutes it travels at an average speed of 60 km/h. Calculate (a) the total distance travelled by the car. (b) the average speed of the car for the whole journey
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Q6) A car travels with speed 30 km h-1 for 30 minute ... - Lido Learning
Video for A car travels for 1.5 hours. For the first 20 minutes it travels at an average speed of 78 km/h and for the remaining 70 minutes it travels at an average speed of 60km/h. Calculate (a) the total distance travelled by the car. (b) the average speed of the car for the whole journey
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Q6) A car travels with speed 30 km h-1 for 30 minute and then with speed 40 km h-1 for one hour. Find : (a) the total distance travelled by the car ...
Top answer · 10 votes
Solution: Speed of car for first 30 minutes = 30 km h−1h^{-1}h−1 Speed of car for next 1 hour = 40 km h−1h^{-1}h−1 (a) total distance travelled ... More
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A car travels at a speed of 80 km/h during the first half of its running ...
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A car travels at a speed of 80 km/h during the first half of its running time and at 40 km/h during the other half , then the average speed of the car.
Let the each half of the running time be t .During first half time, speed of car is 80 km/h Distance covered d1 = 80t km During second half time, speed ...
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