The speed of a river boat is 40 km/h and the rate of flow of the river is 8 km/h. Moving along the same direction as the flow of

the river, the boat traveled 240 km. Calculate the distance the

boat could travel going against the stream in the same time

period.

Distance the boat would travel going upstream = 160 km

Explanation:

First, the time of travel of the boat downstream is calculated.

Time of travel = distance/speed

distance = 240 km;

speed of travel = 40 + 8 = 48 km/h ( since the boat is going downstream)

Time = 240/48 = 5 hours

Therefore, the boat travels for 5 hours.

The distance the boat will travel in 5 hours going upstream is then calculated

distance = speed * time

speed of boat  going upstream = 40 - 8 = 32 km/h

Distance = 32 km/h * 5 hours = 160 km

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d. platinum would have the greatest temperature increase because it has the lowest specific heat.