Question

A car moving 150 km with a speed of 50 km/h, next 200km with a speed of 40 km/h and last 300 km with a speed of 80km/h. Find average speed.

what is the Answer and what is the process to get this question,answer.

how to solve .
please help me​

Answer 1

Answer

Given -

$s_1 = 150 km$ ,$v_1 = 50 km/hr$

$s_2 = 200km$ , $v_2 = 40 km/hr$

$s_3 = 300 km$ , $v_3 = 80 km/hr$

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To find -

Average speed

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Formula used -

Average speed = $\frac{ Total \: distance}{Total \: time}$

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Solution

Time taken by car to travel 150 km =

$t_1 = \frac{150}{50} = 3hr$

Time taken to travel 200 km

$t_2 = \frac{200}{40} = 5hr$

Time taken to travel 300 km

$t_3 = \frac{300}{80} = 3.75hr$

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Total distance = 150 + 200 + 300 = 650km

Total time = 3 + 5 + 3.75 = 11.75 hr

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Average speed = $\frac{650}{11 .75} = 55km/hr$

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Thanks