A distance of 14-4 km is covered in 2 hours 40 minutes. Find the speed in m s-1.
With this speed Sakshi goes to her school, 240 m away from her house and then
returns back. How much time, in all, will Sakshi take ?
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Answer:
Distance = 14.4 km
Time taken to cover = 2 hrs 40 min
= 2. 2/3 = 8/3 hrs
(i) ∴ Speed in m/s = (14.4 × 1000)/(8/3) × 3600
= (144 × 1000 × 3)/(10 × 8 × 3600) = 3/2 m s-1
= 1.5 ms-1
(ii) Distance from house to school and back
= 240 + 240 = 480 m
∴ Time taken = (480/1.5) second
= (480 × 10)/15 = 320 seconds
= (320/60) min = 50 min 20 sec
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