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A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes. The total distance covered by the car is:

(i) 100 km
(ii) 25 km
(iii) 15 km
(iv) 10 km
NCERT Solutions for Class 7th Science Chapter 13 Motion and Time Page 157 Exercise Question 10


We know that
  or,    speed×Time =distance
here, a car run first by speed  40km/h and after 60km/h
 for first 15 min,
    time=15/60 minute

then,  distance=40×15/60
          =60/6=10 km

for next 15 minute

            =60×1/4=15 km

 therefore,  total distance =25 km
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