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The Odometer of a Car Reads 57321.0 Km When the Clock Shows the Time 08:30 Am. What is the Distance Moved by the Car, If at 08:50 Am, the Odometer Reading Has Changed to 57336.0 Km? Calculate the Speed of the Car in Km/Min During this Time. Express the Speed in Km/H Also. - CBSE Class 7 - Science

ConceptConcept of Speed

Question

The odometer of a car reads 57321.0 km when the clock shows the time 08:30 AM. What is the distance moved by the car, if at 08:50 AM, the odometer reading has changed to 57336.0 km? Calculate the speed of the car in km/min during this time. Express the speed in km/h also.

Solution

Initial reading of the odometer of the car = 57321.0 km

Final reading of the odometer of the car = 57336.0 km

Distance covered by the car

= Final reading of the odometer of the car − Initial reading of the odometer of the car

= 57336.0 − 57321.0 = 15 km

The given car starts at 8:30 a.m. and stops at 8:50 a.m.

Therefore, time taken by the car to cover the distance is (8:50 − 8:30) min = 20 min

Distance covered by the car = 15 km

Time taken by the car = 20 min

Speed = "Distanc covered"/"Time  taken" = 15/20 = 0.75 km/min

Again

60 min = 1 h

20 min = 1/60 xx 20 = 1/3 h

Time taken by the car = 1/3 h

Speed = "Distance covered"/"Time Taken" =15/(1/3) = 45 "km/h"

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NCERT Solution for Science Textbook for Class 7 (2018 to Current)
Chapter 13: Motion and Time
Q: 5 | Page no. 156
Solution The Odometer of a Car Reads 57321.0 Km When the Clock Shows the Time 08:30 Am. What is the Distance Moved by the Car, If at 08:50 Am, the Odometer Reading Has Changed to 57336.0 Km? Calculate the Speed of the Car in Km/Min During this Time. Express the Speed in Km/H Also. Concept: Concept of Speed.
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