SOLUTION: on a 100km track, a train travels the first 25 km at a uniform speed of 35km/hr.How fast the train could travel over the next 75 km so as to give an average speed of 50km/hr for th
Algebra.Com
Question 593119: on a 100km track, a train travels the first 25 km at a uniform speed of 35km/hr.How fast the train could travel over the next 75 km so as to give an average speed of 50km/hr for the entire trip
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
on a 100km track, a train travels the first 25 km at a uniform speed of 35km/hr.How fast the train could travel over the next 75 km so as to give an average speed of 50km/hr for the entire trip
-------------
d = r*t
t = d/r
t1 = 25/35 hours
Total time = 100/50 = 2 hours
----
time to travel 75 km = 2 hrs - 5/7 = 9/7 hours
r = d/t
r = 75/(9/7) = 525/9 = 175/3 km/hr
RELATED QUESTIONS
On a 100km track a train travells the first 30km at a uniform speed of 30km/h . How fast... (answered by Fombitz)
Train A is 75 m long & travels at a uniform speed of 54 km/hr. Train B is125m long &... (answered by lwsshak3)
a freight train leaves tamaqua, traveling east at 35km/hr. One hour later a passenger... (answered by stanbon)
A train leaves a station and travels north at 60km/hr. Two hours later, a second train... (answered by richwmiller)
A train leaves a station and travels north at 60km/hr. Four hours later, a second train... (answered by josgarithmetic)
A train leaves station M and travels west at 35km/hr. One hour later, a faster train... (answered by gohar.i.nayab)
A train leaves a station and travels east at 72 km/h. Three hours later a second train... (answered by mananth)
A train leaves the station and travels north at 85 km/hr and four hours later a second... (answered by lwsshak3)
A train leaves Danville Junction and travels north at a speed of 75km/hr. Two hours... (answered by stanbon)