Respuesta :
Answer:
4km/h
Step-by-step explanation:
Given data
speed = 8km/h
time taken= 9 am- 9:15 am = 15 mins
convert 15 mins to hours= 1/60*15 = 0.25 hrs
we can now calculate the distance
speed= distance/time
8= d/0.25
d= 8*0.25
d= 2km
now for Kiran to arrive in 10min (0.16 hrs), since the distance is 2 km
let us find the speed
speed= d/t
speed= 2/0.166
speed= 12.0km/h
Hence she needs to increase her speed by 12-8= 4km/h
Answer:
she should increase the speed by 4 km/hour (that is increase the speed to 12 km/hour) to reach the office at 9:10 am.
Step-by-step explanation:
From the question,
- Kiran starts at 9:00 am and reaches the office at 9:15 am
Hence, she spent 15 minutes to the office
Time, t = 15 mins (Convert this hour)
15 mins = (15/60) hour = 0.25 hour
- Also, she cycles at the speed of 8 km/hour
That is, speed, v = 8 km/hour
First, we will find the distance she traveled,
From,
[tex]Speed = \frac{Distance}{Time}[/tex]
Then, [tex]Distance = Speed \times Time[/tex]
Hence,
[tex]Distance = 8km/hour \times 0.25 hour[/tex]
[tex]Distance = 2 km[/tex]
Hence, the distance she traveled is 2km.
Now, to determine how much she should increase the speed to reach the office at 9:10 am
That is, we will find the speed to reach the office in 10 minutes
Hence, Time = 10 mins (convert to hour)
10 mins = (10/60) hour = 1/6 hour
The distance she is to travel is the same.
That is, distance = 2 km
Now, to determine the speed.
From,
[tex]Speed = \frac{Distance}{Time}[/tex]
[tex]Speed = \frac{2 km}{\frac{1}{6}hour }[/tex]
[tex]Speed = 12 km/hour[/tex]
To reach the office at 9:10 am, she must travel at a speed of 12 km/hour.
Hence, she must increase the speed by (12 - 8) km/hour = 4 km/hour.
