Question

A car covers first 160 m with speed of 36km/h and remaining 300m of journey with speed of

108km/h. what is the average speed for whole journey?​

Answer 1

Answer:

63.69 km/h

Explanation:

Total Distance = 160 + 300 m= 460 m

Speed for 1st half = 36 km/h = 10 m/s [1 km/h = 5/18 m/s]

Speed for 2nd half = 108 km/h = 30 m/s

Total Time = 160/10 + 300/30 s = 16 + 10 s = 26 s

Average speed = 460/26 m/s = 460/26 × 18/5 km/h = 63.69 km/h

Answer 2

63.6 Km/hr is the average speed of the journey.

Explanation:

Given that,

$d_{1}$ = 160m

$d_{2}$  = 300 m

$s_{1}$ = 36km/hr

$s_{2}$ = 108 km/hr

$t_{1}$ = Distance/Speed

= $\frac{\frac{160}{36 * 1000}}{60 * 60}$

= 160/(36 * 1000) * 60 * 60

= 16 sec

$t_{2}$ = distance/speed

= $\frac{\frac{300}{108 * 1000} }{60 * 60}$

= (300 * 60 * 60)/ 108 * 1000

= 10 sec

Average speed = Total Distance covered/Total time taken

Total distance = 160 m + 300m

= 460 m

Total time = 16 + 10 = 26sec

Average speed = 460/26

= 17.69 m/s

In km/hr

= (460 * 60 * 60)/(26 * 1000)

= 63.6 Km/hr

Learn more: find the average speed

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