Question

Ram covers the 1st part of his journey at 90Km/h in 40mins and the remaining 80Km at a certain speed. It his average speed for the entire journey was 84Km/hr. what was his speed during the remaining part of his journey ? (In Km/h)

Answer 1

Answer:

Step-by-step explanation:

80

Answer 2

Answer:

80 km/hr

Step-by-step explanation:

Speed in first part = 90 km /hr

Time in covering first part = 40 mins = $\frac{40}{60}$

Distance = $Speed \times Time$

Distance = $90 \times \frac{40}{60}$

Distance = $60$

We are given that remaining distance is 80 km

So, total distance = 60 km+ 80 km= 140 km

We are given that his average speed for the entire journey was 84Km/hr.

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

$84  =\frac{140}{\text{Total time}}$

$\text{Total time} =\frac{140}{84}$

$\text{Total time} =\frac{140}{84}$

Time in second part =  $\frac{140}{84} -\frac{40}{60}= 1  hour$

Distance in second part = 80 km

Time = 1 hour

Speed = $\frac{80}{1}=80km/hr$

Hence the speed of during the remaining part of his journey is 80 km/hr