Question
On a 120km track,a train travels the first 30km at a uniform speed of 30km/hr.how fast must the train travel the next 90km so as to average 60km/hr for the entire trip?
Answers
The train travelled 30km at 30km/hr. It took therefore 30/30=1 hr.
To attain an average of 60km per hour over 120 km, the total time must be 120/60=2 hours.
There is (2-1)=1 hour left to do the remaining 90km. What should be the speed?
To attain an average of 60km per hour over 120 km, the total time must be 120/60=2 hours.
There is (2-1)=1 hour left to do the remaining 90km. What should be the speed?
120
Related Questions
On a 120 km track, a train travels the first 30 km at a uniform speed of 30km/h. How fast must the t...
a train travels the first 30 km of 120 km track with a uniform speed of 30km/h.What should be the sp...
On a 60 km track,a train travels the first 30 km at a uniform speed of 30 km per hour. How fast the...
On a 120km track a train travel the first 30km at a uniform speed of 30km/hr calculate the speed wi...