Round Trip Travel Time Of An fire Brigade
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Answered
A fire Brigade travels 10 miles at a speed of 50 miles per hour.
How fast must the fire Brigade travel on the return trip if the round-trip travel time is to be 20 minutes?
Best answer
Answer – 75miles/hour
EXPLANATION–
For 50 miles it takes 1 hour to travel
So, for 10 miles it takes 10/50 hours
= (10/50) *60mins
= 12minutes
So return time should be 20-12=8minutes
Speed=10/8 in miles per minute [Speed=Distance/Time]
=(10*60)/8 in mile per hour
=75
Ans. 75miles/hour
Time (minutes) = Distance *60 / speed (mph) so 60*10/50 =12 min.
So we have (20-12=8) minutes for return
so according to above formula 60*10/8 =75 (mph)
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