Question

A train is moving at a uniform speed of 75 km/hour.
(1) how far will it travel in 20 minutes.
(2) Find the time required to cover a distance of 250 km.

Answer 1

The whole sum is in the S.I. Unit:

Speed= 75km/hr
         = $\frac{75×1000}{60×60}$ m/s
         = $\frac{125}{6}$ m/s

1) Time= 20 mins= 20×60 secs= 1200secs
Distance = Speed×Time
D= $\frac{125}{6}$×1200 metres
D= 25000 m= 25 km

2) Distance= 250km = (250×1000) metre, Speed=$\frac{125}{6}$
Time=$\frac{Distance}{Speed}$
T=12000secs= 3.33 hour

Answer 2

Speed of trian = 75 km/hr = 75 km in 60 min

60 min     -   distance covered 75 km
20 min     - distance covered = ?

i) Distance = $\frac{20}{60} X 75 = 25 Km$

To cover a distance of 75 km it takes 60 min
to cover a distance of 250 km, how many min?

time = $\frac{250}{75} X 60 = 200 minutes = 3 hours 20 min$