a student travelled from his village to the school at the rate of 20kms per hour and walked back at the rate of 15km/hour.If the whole journey took 1hr 24 minutes, the distance of school from his village is?
Answers
Explanation:
T1+T2=1hr.24min
d/20+d/15=1.4
3d+4d/60=1.4
7d= 1.4×60
7d=84
d=12km
Answer:
The distance covered by student from school to village = 52.5 kms
Explanation:
Speed:
- The rate of change of position of an object in any direction.
Types of Speed:
- If an object travels the same distance in the same amount of time, it is said to be moving at uniform speed.
- When an object travels a different distance at equal intervals of time, it is said to be moving at variable speed.
- Average speed is the average speed determined by the ratio of the total distance travelled by an object to the entire amount of time it took to travel that distance.
- Instantaneous speed: The speed of an object at any given moment when it is travelling at a variable speed is referred to as the object's instantaneous speed.
Given,
Speed of the student travelled from village to school = 20 kms/hr
Speed of the student travelled from school to village = 15 kms/hr
Total speed = 20 + 15 = 35kms/hr
The time taken by student for whole journey = 1hr 24 mins
= hr
= 3/2 hr
Let the distance from village to school = d
Relation between Speed, Distance and Time:
Speed = distance/time
distance = Speed × time
d = 35(3/2) kms
d = 52.5 kms
The distance covered by student from school to village = 52.5 kms
Know more about Speed:
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Know more about Time:
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