A bus cover a distance of 300 km in 7.5 hours . calculate the speed in metre per second
Answers
Explanation:
distance=300km=300×18/5=60×18
=1080m
time =7.5 h=7.5×60×60=27000s
speed=distance /time
=1080/27000=0.04m/s
Answer:
When distance and speed are given the time taken is calculated by using the formula:
Time = Distance/Speed
Solved examples to calculate time when speed and distance are given:
1. How much time will be taken to cover a distance of 300 km at a speed of 60 km per hour?
Solution:
Time taken to cover 60 km = 1 hour.
Time taken to cover 1 km = 1/60 hour.
Time taken to cover 300 km = 1/60 × 300 hour.
= 5 hours.
Therefore, time taken to cover 300 km is 5 hours.
2. A man runs at the speed of 15 km per hour. How much time will he take to cover 750 metres?
Speed = 15 km per hour
Distance = 750 metres = 750/1000 km = ¾ km
Time = distance/speed = (3/4 ÷ 15) km
= (3/4 × 1/15) hr
= 1/20 hr
= 1/20 × 60 min = 3 minutes.
3. How much time will be taken to cover a distance of 450 km at a speed of 50 km per hour?
Solution:
Time taken to cover 50 km = 1 hour.
Time taken to cover 1 km = 1/50 hour.
Time taken to cover 450 km = 1/50 × 450 hour.
= 5 hours.
Therefore, time taken to cover 450 km is 9 hours.
4. A motorised rickshaw covers a distance of 150 km at a speed of 30 km/hour. Find the time taken to cover this distance.
Time = distance/speed
Time = 150 km/(30 km/hour)
= (150 km/30 km) × hour
= 5 hours.
5. A cyclist covers a distance of 12 km at a speed of 8 km per hour. Calculate the time taken to cover this distance.
Speed = 8 km/hour
Distance covered = 12 km
Time taken = total distance covered/speed
= 15/8 hour
= 3/2 hours
= 1 ½ hours.
6. How much time will be taken to cover 20 m at a speed of 20 cm per second?
Solution:
Time taken to cover 20 cm = 1 sec.
Time taken to cover 1 cm = 1/20 sec.
1 metre = 100 cm,
20 metre = 20 × 100 cm.
= 2000 cm.
Time taken to cover 20 m = 1/20 × 2000
= 200 sec.
Therefore, time taken to cover 20 m is 200 sec.
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