3. How many minutes are saved by travelling 30 km at 90 km/h instead 80 km/he?
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4.5 minutes minutes are saved by travelling 30 km at 90 km/h instead 80 km/h
Step-by-step explanation:
GIVEN
Distance = 30 km
Speed 1 = 90 kk/h
Speed 2 = 80 km/h
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TO FIND
How many minutes are saved by travelling 30 km at 90 km/h instead 80 km/h
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FORMULAS
Speed = Distance / Time
Distance = Speed × Time
Time = Distance / Speed
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We know that,
Time = Distance / Speed
Time = 30 / 90
Time = 0.3
Time = 0.3 hours
Time = 18 minutes
30 km at speed of 90 km/h will travel in 18 minutes
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We know that,
Time = Distance / Speed
Time = 30 / 80
Time = 0.375
Time = 0.375 hours
Time = 22.5 minutes
30 km at speed of 80 km/h will travel in 22.5 minutes
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Now
Let's find how many minutes are saved
Saved Time = 22.5 minutes - 18 minutes
Saved Time = 4.5 minutes
Saved Time = 4.5 minutes
4.5 minutes minutes are saved by travelling 30 km at 90 km/h instead 80 km/h
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