Question
a train travels a 20 km. at a uniform speed of 60 km/hr. and next 20 km. at a uniform speed of 80km/hr. Calculate the average speed of
Answers
time for slow part = 20 km/(60 km/h) = 1/3 hrs
time for faster part = 20 km/(80 km/h) = 1/4 hrs
total time = 1/3 + 1/4 hrs or 7/12 hrs
total distance = 40 km
avg speed
= total distance/total time
= 40 km/(7/12 hrs)
= appr 68.6 km/h
time for faster part = 20 km/(80 km/h) = 1/4 hrs
total time = 1/3 + 1/4 hrs or 7/12 hrs
total distance = 40 km
avg speed
= total distance/total time
= 40 km/(7/12 hrs)
= appr 68.6 km/h
Related Questions
A train normally travels at a uniform speed of 74km/h on a long stretch of straight, level track. On...
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...
A train travels 360 km at uniform speed . if the speed had been 5 km / hr more it would have taken 1...