Calculate the speed of a bus which travels at the distance of 480 km in 8 hours covert the speed 2m per second.
Answers
Answer:
The original speed of the train is 40 km/hour
Step-by-step explanation:
Let the original speed of the train be x km/hour
Distance traveled by the train = 480 km
\begin{gathered}\text{Time taken by train = }\frac{480}{x}\\\\\text{If the train would have taken 3 hours more then time = }\frac{480}{x-8}\\\\\implies \frac{480}{x}=\frac{480}{x-8}+3\\\\\implies \frac{480}{x}-\frac{480}{x-8}=3\\\\\implies 3x^2-24x+3840=0\\\\\implies x^2-8x+1280=0\\\\\implies \text{ x = -32 or x = 40}\\\\\text{But speed can not be negative }\implies x=40\end{gathered}Time taken by train = x480If the train would have taken 3 hours more then time = x−8480⟹x480=x−8480+3⟹x480−x−8480=3⟹3x2−24x+3840=0⟹x2−8x+1280=0⟹ x = -32 or x = 40But speed can not be negative ⟹x=40
Hence, the original speed of the train is 40 km/hour
Answer:
speed=distance/time
s=480/8=60km/hr
60km/hr=60*1000/1*3600
=60000/3600