Question

3] The odometer of a car reads 67321 km when the clock show the time 9:30 AM. What is the distance

moved by the car, if at 9:50 AM, the odometer reading has changed to 67336 km. Calculate the speed​

Answer 1

Answer:

Speed = 12.5 m/sec

Step-by-step explanation:

Given -

Car's odometer on 9:30 AM = 67321 km (start)

Car's odometer on 9:50 AM = 67336 km (end)

to find -

the speed of car

solution -

to find the speed we want total distance and total time.

total distance = odometer on ending - odometer on starting

= 67336 km - 67321 km

= 15 km

1 km = 1000 m

15 km = 15000 m

total time = time on ending - time on starting

= 9:50 AM - 9:30 AM

= 20 minutes

1 min = 60 sec

20 min = 20×60 sec = 1200 sec

speed = total distance / total time

= 15000 m/1200 sec

= 150/12 m/sec

= 12.5 m/sec

Hence speed of car = 12.5 m/sec

hair which changed the unit of time and distance because the SI unit of speed is metre/second or kilometre/hour. if we changed into kilometre and hour the units, the units will be in decimals. then we will face some problems to getting the speed, that why we changed into metre and second.

hope it helps.