Question

A man completes 30 km of a journey at 6 km/hr and the remaining 40km in 5 hours. His average speed for the whole journey is

Answer 1

Step-by-step explanation:

Distance traveled=30km

Speed =6km/hr

Time=30/6

5hours

average speed = total distance/total

time

average speed =30+40/5+5

70/10

7km/hr

Hence, the average speed for whole journey is 7km/hr.

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Answer 2

Answer:

Average speed = 7 km/hr

Step-by-step explanation:

$D{_1} = 30km$

$D{_2} = 40km$

Total distance = $D{_1} +D{_2}$

= 30 + 40 = 70km

Total Distance covered by a man = $D{_1} +D{_2}$

= 30 + 40

= 70km

$time = \frac {distance} {speed}$

$T_{1}= \frac {30}{6}$

$T_{1} = 5hours$

$T{_2} = 5 hours$

Total time = $T_{1} + T_{2}$

= 5 + 5

= 10 hours

Average Speed = $\frac {total \ distance}{total \ time}$

$=\frac {70}{10}$

= 7km/hr

So, his average speed of the whole journey is 7km/hr