Duting the buildup to a tornado wind speeds can increase by

Duting the buildup to a tornado, wind speeds can increase by up to 4.6% per minute. Under such conditions, how long would it take wind speeds to increase from 60 miles per hour to \'incredible tornado\' status (F5 on the Fujita Scale of tornado intensity), whic is marked by winds of 270 miles per hours?

Solution

we can increase the speed by:4.6% per minit

                                              i.e 4.6*60=276 miles per hour

    actual condition speed is:60 miles per hour

to increase this to 270 miles per hour

             we need to increase this: 4.5% per minit   then it became 4.5*60=270 miles per hour.