Question

a car covers 850km in 10 hrs 40 min .find its speed in km/hr

Answer 1

Here is your answer

Distance = 850 km

Time = 10 hrs 40 min.
$= 10 + \frac{40}{60} \\ = 10 + \frac{2}{3} \\ = \frac{30 + 2}{3} \\ = \frac{32}{3}hrs$
Now
As we know the formula

Speed = Distance/Time
$= \frac{850}{ \frac{32}{3} } \\ = \frac{850 \times 3}{32} \\ = 79.68 \: km \: per \: hr$
Therefore
Speed of Car is 79.68 km/ hr

Hope it helps you

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Answer 2

Its speed in km/hr is 53.125 km /hr

Step-by-step explanation:

Distance covered = 850 km

Time taken to cover 850 km = 10 hrs 40 min

60 minutes = 1 hour

1 minute =$\frac{1}{60} hour$

40 minutes =$\frac{40}{60} hour$

Time taken to cover 850 km = 10 hrs 40 min =$10+\frac{40}{60}=\frac{32}{3}$

Speed = $\frac{Distance}{Time}=\frac{850}{\frac{32}{2}}=53.125 km /hr$

Hence  its speed in km/hr is 53.125 km /hr

#Learn more;

An aeroplane travelled 4320 km in 6 hr find its speed in km /hr ()m/sec

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