Question

atruck travels some distanve ata a speed of 35km /h in 120 min and the remaining distance at a speed of 48km /h in 90min .find the average speed over the entire journey​

Answer 1

Answer:

Case (I) :

• Speed = 35 km/hr
• Time = 120 min = 2 hr
• Distance = Speed × Time = 35 × 2 = 70 km

Case (II)

• Speed = 48 km/hr
• Time = 90 min = 1.5 hr
• Distance = Speed × Time = 48 × 1.5 = 72 km

➝ Total Distance = 70 + 72

➝ Total Distance = 142 km

☯ $\underline{\boldsymbol{According\: to \:the\: Question\:now :}}$

$\sf => Average \: Speed = \dfrac{Total \: Distance}{Total \: Time \: taken}$

$\sf => Average \: Speed = \dfrac{142}{2 + 1.5}$

$\sf => Average \: Speed = \dfrac{142}{3.5}$

$=> \underline{ \boxed{ \sf Average \: Speed = 40.57 \:km/hr }}$

Therefore, Average Speed over entire journey is 40.57 km/hr.