Question

The odometer of a car reads 57321.0 km when the clock shows the
8:30 AM. What is the distance moved by the car, if at 8:50 AM, the
odometer reading has changed to 57336.0 km? Calculate the speed of
the car in km/min during this time.​

Answer 1

Distance covered at 8:30 = 57321 km

Distance covered at 8:50 = 57336 km

Final distance covered = 57336 - 57321 = 15 km

Speed of car during this time = Distance/ Time = 15/20 ( Time between 8:30 & 8:50 is 20 min.)

= 3/4 = 0.75 km/min.

Answer 2

Given :

The odometer of a car reads 57321.0 km when the clock shows the time 8:30 AM.

To find :

Distance moved by the car, If at 8:50 the odometer reading has changed to 57336.0 km.

Calculate the speed of the car in km/min.

$\;\large\underbrace{\underline{\sf{Understanding\;the\;Concept}}}$

The concept used in the question is change in the reading of odometer with respect to change in time. In the question, Given the values of odometer reading and time of the clock. We are told to find the distance and speed of the car. To find it, we will use the formula of distance and speed.

Formulas to be used :

• Distance = Change in distance.

• Speed = Distance/time.

Solution :

To find the distance = ?

⟹ Distance = 57336.0 - 57321.0

⟹ Distance = 15 km.

The distance covered by the car in that time is 15km.

Change in time will be,

⟹ Time, t = 8:50 - 8:30

⟹ Time, t = 20 minutes.

Speed of the car = ?

Speed = Distance/time.

⟹ Speed = 15km/20min

⟹ Speed = 3/4 km/min.

⟹ Speed = 0.75 km/min.

The speed of the car is 0.75 km/min.