Julia drives an average speed of 110km/h. She will reach her destination in 7 hours and 30 minutes. Calculate the average speed she has to drive to reduce the time to reach her destination by 30 minutes.
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118 km/h should be the speed
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Answer:
The answer is 118km/h
Step-by-step explanation:
Firstly calculate the distance she has to travell by using the formula l=v×t , the full time is t=7h +0.5 h t=7.5 h. Now find the distance l=110km/h×7.5 h= 825km. After doing this find the reduced time which is t = 7.5h-0.5h= 7 h. Now lets find the average speed she has to drive to arrive to the destination in 7h v=l/t v=825/7 = 118 km/h
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