Dona drove 300 miles north from san antonio, mostly on the freeway. she usually averaged 55 mph, but an accident slowed her speed through dallas to 15 mph. if her trip took 6 hours, how many miles did she drive at the reduced rate ?

The distance she took at reduce speed is 11.25  miles

Step-by-step explanation:

Given as :

The Distance cover from San Antonio before accident = D miles

The Distance cover after accident = ( 300 - D ) miles

The average speed before accident = 55 mph

The average speed after accident = 15 mph

Total time for the journey = 6 hours

Now, Time =

∴ + = 6

Or, = 6

Or,   = 6

Or,  3300 - 8 D = 165 × 6

Or,  3300 - 8 D = 990

Or, 8 D = 2310

∴       D = = 288.75 miles

The distance travel at reduce speed = 300 - D

                                                             = 300 - 288.75

                                                             = 11.25  miles

Hence The distance she took at reduce speed is 11.25  miles

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.