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A boat moves 15.6 km across a lake in 30.0 min. What was the average speed of the boat in kilometers per hour?

1 Answer

Apr 15, 2017

The average speed of the boat was $31.2 \frac{k m}{h}$ $31.2(km)/h$

Explanation:

Speed of the boat is determined using the formula $d = r t$ $d=rt$
which equates the distance traveled to the rate (speed) multiplied by the time.

$d = 15.6 k m$ $d=15.6km$
$t = 30.0 m = 0.5 h$ $t=30.0m=0.5h$

$d = r t$ $d=rt$
$(15.6) = r (0.5)$ $(15.6) = r(0.5)$

$\frac{15.6}{0.5} = r$ $(15.6)/(0.5)=r$

$r = 31.2 = 31.2 \frac{k m}{h}$ $r= 31.2=31.2(km)/h$

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