Maths-
General
Easy
Question
Julie and Jeanette enjoy finishing their 6 km morning run together. Julie runs at an average speed of 10 km/h and Jeanette runs at an average speed of 3 m/s. If Julie leaves at 8 a.m., at what time should Jeanette leave if they are to finish their run at the same time?
Hint:
When two quantities of different units are compared and expressed as a ratio, it is known as Rate. For example, a car travels at a speed of 100 kilometres per hour, then it means in one hour it covers 100 kilometres.
The formula of speed is
Speed = 
The correct answer is: 8: 2.7 am
Step 1 of 2:
The distance travelled by both Julie and Jeanette is 6 km.
Average speed of Julie = 10 km/h
Time taken by Julie to cover 6 km = = 
= 
hours = 36 min
So, if Julie leaves at 8 a.m., she will finish her run at 8:36 am
Step 2 of 2:
Now, Average speed of Jeanette = 3 m/s = 
km/h = 
km/h
Extra time taken by Julie as compared to Jeanette to cover the distance = 36 - 33.3 = 2.7 min
So, Jeanette will leave 2.7 min late as compared to Julie to finish their run at the same time.
Final Answer:
Hence, Jeanette will leave at 8: 2.7 am.
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