In calm water, what is the boat's speed? I.Running upstream, the boat covers a distance of 48 kilometres in 6 hours. II.Running downstream, the boat covers the same distance in 4 hours.
A. I alone sufficient while II alone not sufficient to answer
B. II alone sufficient while I alone not sufficient to answer
C. Either I or II alone sufficient to answer
D. Both I and II are not sufficient to answer
Answer:D
In calm water, what is the boat's speed? I.Running upstream, the boat covers a distance of 48 kilometres in 6 hours. II.Running downstream, the boat covers the same distance in 4 hours.
A. I alone sufficient while II alone not sufficient to answer B. II alone sufficient while I alone not sufficient to answer C. Either I or II alone sufficient to answer D. Both I and II are not sufficient to answer
Explanation: Upstream speed = 48/6 km/hr = 8 km/hr.II. Downstream speed = 48/4 km/hr = 12 km/hr.Boat speed = 1/2 (8 + 12) km/hr = 10 km/hr.As a result, the solution is given by combining I and II.