lisa began her journey from home at 1350 and reached her destination at 1415.
A.how long did she take for the whole journey?
B.if the total distance taken was 45 km,find her speed.
time taken = 14:15 - 13:50
= 25 minutes
speed = distance / time = 45/(25/60)
= 45(60/25) = 108 km
To determine how long Lisa took for the whole journey, we need to calculate the time difference between the starting time and the arrival time. Here's how we can do it:
A. Calculate the time difference between the two times:
1415 (arrival time) - 1350 (starting time) = 65 minutes
So, Lisa took 65 minutes for the whole journey.
B. To find Lisa's speed, we need to divide the total distance traveled by the time taken.
Given that the total distance taken was 45 km and the time taken was 65 minutes, we need to convert minutes to hours to match the distance unit. There are 60 minutes in an hour, so:
65 minutes ÷ 60 minutes/hour = 1.0833 hours (rounded to 4 decimal places)
Now, we can calculate the speed:
Speed = Distance ÷ Time
Speed = 45 km ÷ 1.0833 hours
Speed ≈ 41.482 km/h (rounded to 3 decimal places)
Therefore, Lisa's speed during the journey was approximately 41.482 km/h.