Time ratio for upstream to downstream distance is 5 ∶ 3. Downstream speed is 15 km/hr, find the time to travel a distance of 31.5 km in upstream (in hour).
1
2
2
2.5
3
3
4
4
5
none of these
Time ratio for upstream to downstream distance is 5 ∶ 3. Downstream speed is 15 km/hr, find the time to travel a distance of 31.5 km in upstream (in hour).