A car travels for 4 hours at an average speed of 45 mph and then 6 hours at an average speed of 35 mph. (a) Work out the total distance travelled.
(b) Work out the average speed for the entire journey.

(a) 390 miles im not sure for b

Step-by-step explanation:

step-by-step explanation:

try remembering the steps

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.