Even though you can plug in numbers to solve this question, it is important to notice one important algebraic caveat in this type of problems.
Statement 1 is sufficient. However it provides only 1 equation with 2 variables.
R (1.5) (2) = D
At first glance, it looks like you cannot solve this using the Equation Rule of Sufficiency (the one that states that "you need n number of distinct, linear equations to solve for n variables..."). The catch is that all Distance problems are already giving us 1 equation and 3 variables, namely R * T = D.
So when you look at statement 1 you actually have 2 equations and 3 variables
(1.5) (2) = D/R
T = D/R
If you substitute, you kill one variable and thus you can solve.
(1.5) (2) = T
3 = T
Statement 2 is insufficient.
The equations you have are:
T = D/R
R = 50
3 Variables, 2 Equations --> Insufficient.
Consider giving me Kudos if I helped, but don´t take them away if I didn´t!
What would you do if you weren´t afraid?