A journey takes 4 hours 30 minutes at a speed of 60 km per hour. How long will the same journey take at a speed of 15 minute per second
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time=4 30/60= 4 1/2=9/2
speed=60km
distance= s*t
60*9/2
= 117km
distance =117km
speed=15 min
=15/60
=1/4hrs
t=d/s
117/15
39/5
=7 4/5 hrs
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