II. A car has to cover 280 km in 5 hours. For the first three hours it travels at a speed of 50 km
per hour. What should be its speed after that to reach the destination in the desired time?
12. An aeroplane takes 3 hours to travel a distance of 3 300 km. Another aeroplane travels at
Answers
Answer:
Desired:
A car to cover a distance of 280 km in 5 hours.
First Phase:
3 hours taken by car and distance covered = S1 = speed × time
S1 = 50 × 3 = 150 km
This implies in 3 hours distance covered is 150 km.
2nd Phase:
Desired: At what speed car should travel to cover a remaining distance in remaining time.
Remaining distance to cover=S2= 280 - 150 =130 km
Remaining time for travelling=t2= 5- 3 =2 hours
Distance covered= speed × time =>
Speed = Distance covered/time
Speed = 130 / 2 =65 km/h
Desired speed= 65 km/h
Step-by-step explanation:
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Answer:
Solution:
Desired:
A car to cover a distance of 280 km in 5 hours.
First Phase:
3 hours taken by car and distance covered = S1 = speed × time
S1 = 50 × 3 = 150 km
This implies in 3 hours distance covered is 150 km.
2nd Phase:
Desired: At what speed car should travel to cover a remaining distance in remaining time.
Remaining distance to cover=S2= 280 - 150 =130 km
Remaining time for travelling=t2= 5- 3 =2 hours
Distance covered= speed × time =>
Speed = Distance covered/time
Speed = 130 / 2 =65 km/h
Desired speed= 65 km/h