Question

Please tell answer I will mark him or her brainliest and also I will follow him or her.​

Answer 1

Answer:

90km/h

Explanation:

Given :

Average speed = 60 km/h

Total distance = 120 km

speed for Ist 30km = 30km/h

Time taken for Ist 30km= 1 Hr ( v=s/t )

Now

Average speed = Total distance/ Total Time

60 = 120/t

t= 2 hr

Total Time = 2 hr- 1hr = 1hr (for remaining 90km)

Speed = distance/Time

speed = 90/1

speed = 90km/ h

Answer 2

$\huge\tt\underline\red{Solution:-}$

$\tt{Average\: speed=Total \:distance \:Total\: time\: taken}$

$\red\implies$  $\tt{V_{av} =\frac{d}{t}ort=\frac{d}{V_{av}}}$

$\tt{For\: 120 km,}$

$\tt{t=\frac{120km}{60km/hr} =2hr....(1)}$

$\tt{For\:1st\:30km,}$

$\red\implies$ $\tt{t_{1} =\frac{30km}{30km/hr} =1km/hr}$

$\tt{For\: remaining\: 90 km,}$

$\red\implies$ $\tt{t_{2}= t-t_{1} =2-1=1hr}$

$\tt{Speed=\frac{Distance}{Time} \:or\:v_{2}=\frac{d_{2} }{t_{2} }}$

$\red\implies\tt{\frac{90}{1}}$

$\red \implies\tt{90km/hr}$