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16.8 sec
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first let's convert into m/hour
1 km = 1000 meter then speed is
15*1000 / hour
=15*1000 / 3600 sec
= 15* 5/18
= 75/18 m/s
dist to cover is 750 m,
we know Dist = speed * time
time = dist / speed
= 750 /75 * 18
= 10*18
= 180 secs or 3 mins
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