a boy run with a speed of 5 km/h for 15 minutes and 5.5 km /h for the next 10 minutes..find average speed.
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Answer:
21.6m/s
Step-by-step explanation:
he ran 5km/h for 15mins - 1
5.5 km/hr for next 10 mins- 2
so, first we should change km/h
into m/s .
5km/h × 18/5 = 18m/s
5.5km/h × 18/5= 19.8 m/s
so, 18m/s - 15mins
19.8m/s - 25mins
so, average = 19.8 + 18/2
= 198 + 18 / 2×10
= 99+9/5
= 108/5
= 21.6 m/s ..
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