Question

Brian travels a distance at a speed of 12 km/h and returns at 9 km/h. If the total time taken by him is 3 h 30 min, find the distance he travelled one way.​

Answer 1

Answer:

Ok

Step-by-step explanation:

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Answer 2

Answer:

Answer is 18km

Step-by-step explanation:

Speed = 12 km/hr

Let the distance is x km

Time = Distance/ speed

= \frac{x}{12}=

12

x

For Return

Speed = 9km/hr

Time = Distance/Time

\begin{gathered} = \frac{x}{9} \\ \end{gathered}

=

9

x

Now Total time is 3 hr and 30 min

= 3.5 hrs

ATQ

\begin{gathered} \frac{x}{12} + \frac{x}{9} = 3.5 \\ \frac{3x + 4x}{36} = 3.5 \\ 7x = 3.5 \times 36 \\ 7x = 126 \\ x = \frac{126}{7} \\ x = 18 \: km\end{gathered}

12

x

+

9

x

=3.5

36

3x+4x

=3.5

7x=3.5×36

7x=126

x=

7

126

x=18km