Question

how many minutes are saved by travelling 30 km at 90 km/ hr instead of 80 km/ hr​

Answer 1

Answer:

2.5 minutes

Step-by-step explanation:

As you know, Speed=Distance/Time

Hence, Time=Distance/Speed

So the time required to travel 30 km at 90 km/hour:

Time=30/90=0.33333 hours=20 minutes

And the time requires to travel 30 km at 80 km/hour:

Time=30/80=0.375 hours = 22,5 minutes

Hence the minutes saved= 22.5-20=2.5 minutes

Answer 2

Answer:

2.5 seconds

Step-by-step explanation:

As you know, Speed=Distance/Time

Hence, Time=Distance/Speed

So the time required to travel 30 km at 90 km/hour:

Time=30/90=0.33333 hours=20 minutes

And the time requires to travel 30 km at 80 km/hour:

Time=30/80=0.375 hours = 22,5 minutes

Hence the minutes saved= 22.5-20=2.5 minutes