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Ncert exemplar solutions
Grade 7 
Science
Science Exemplar Problems - class 7
Motion and Time
Motion and Time - Exercise
Question 4
Science
Science Exemplar Problems - class 7
Motion and Time
Motion and Time - Exercise
Question 4
Motion and Time | Motion and Time - Exercise
Question 4
A bus travels 54 km in 90 minutes. The speed of the bus is
(a) 0.6 m/s
(b) 10 m/s
(c) 5.4 m/s
(d) 3.6 m/s
The answer is (b) 10 m/s
Explanation:
Speed = Distance / Time
Distance = 54km = 54 x1000 = 54000m
Time = 90 minutes = 90x60= 5400s
Speed = 54000/5400 = 10 m/s
Question 4
A bus travels 54 km in 90 minutes. The speed of the bus is
(a) 0.6 m/s
(b) 10 m/s
(c) 5.4 m/s
(d) 3.6 m/s
The answer is (b) 10 m/s
Explanation:
Speed = Distance / Time
Distance = 54km = 54 x1000 = 54000m
Time = 90 minutes = 90x60= 5400s
Speed = 54000/5400 = 10 m/s
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