mangamma
A motorcyclist travelling at a constant speed of x miles per hour covers a total distance of 150 miles. What is the value of x?
(1) It takes the motorcyclist 400 minutes to cover the total distance of 150 miles.
(2) The motorcyclist covers (x+45) miles in 3 hours
Solution: Pre Analysis:- \(Speed = x\) miles per hour
- \(Distance = 150\) miles
- Therefore, \(Time = \frac{Distance}{Speed}=\frac{150}{x}\) hours
- We are asked the value of x i.e., speed
Statement 1: It takes the motorcyclist 400 minutes to cover the total distance of 150 miles
- According to this statement, time to cover 150 miles = 400 mins = 400/60 hours
- So, we can write \(\frac{150}{x}=\frac{400}{60}\)
- From which we can get the value of x easily
- Thus, statement 1 alone is sufficient and we can eliminate options B, C and E
Statement 2: The motorcyclist covers (x+45) miles in 3 hours
- According to this statement, speed of motorcycle \(=\frac{x+45}{3}\)
- We can equate this to \(\frac{x+45}{3}=x\) and get the value of \(x\) easily
Hence the right answer is
Option D