"Rohan covers `2/3`rd of a certain distance in 2 hours 30 minutes at the rate of `x`kmph.
Channel: Doubtnut
Date: 05/04/2020

"Rohan
 covers `2/3`
rd
 of a certain distance in 2 hours 30 minutes at the rate of `x`
kmph.
 He covers the remaining distance at the rate of `(x\ +\ 2)`
kmph
 in 50 minutes. What is the total distance? 
`21\ k m`
b. `18\ k m`
c. `16\ k m`
d. `15\ k m`"