Question

A train travels 20 km at a uniform speed of 60 km and the next 20 km at a uniform speed of 60 km and the next 20 km at a uniform speed of 80 km calculate its average speed

Answer 1

this may help u.........

Answer 2

Ans

»A train travells 20km at Speed of 60kmph=20/60=0.3hr

»For another 20km also it takes 0.3 hr

»And for next 20km it takes 80kmph=20/80=0.25 hr

»Avg Speed =total distance travelled /total time

»Total distance=20+20+20=60

»Total time=0.3+.03+0.25=0.85

»Avg Speed =60/0.85=70.5km/hr