A car travels with speed of 50 km / h for 30 minutes and then with speed of 80 km / h for 40 minutes. Find: i. The total distance travelled by the car. ii. The total time of travel iii. The average speed of car.
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Given:
- Speed of car = 40 km/hr for 30 mins
- Speed of car = 80 km/hr for 40 mins
To Find:
- (i) The total distance travelled by the car.
- (ii) The total time of travel.
- (iii) The average speed of car.
Solution:
(i) The total distance travelled by the car = ?
In 30 minutes i.e. 0.5 hour, the car travelled at the speed of 50 km/hr.
Speed = Distance travelled/time taken
Distance = Speed × time
Distance = 50 × 0.5
Distance = 25 km
In 40 mins i.e. 0.6 hour, the car travelled at the speed of 80 km/hr.
Distance = 40 × 0.6
Distance = 24 km
∴ Therefore, The total distance covered by the car is 25 km + 24 km = 49km.
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(ii) The total time of travel = ?
Hint: Find the total time by using formula.
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(iii) The average speed of car = ?
Hint: Find the average speed by using the formula :- v = ∆x/∆t
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