Miscellaneous Question 14
- The time taken by a boat to travel a distance downstream is half the time taken by it to travel the same distance upstream. What is the speed of the boat downstream if it travels $7.5 $ $km$ upstream in 1 hour 30 minutes ? (in $km / h$ )
7.5
5
9
10
(5) None of these
(IBPS Bank PO/MT CWE-V (Preliminary) 10.10.2015)
Show Answer
Correct Answer: 14. (4)
Solution: 14. (4) Time taken in covering 7.5 km upstream $=\frac{2}{3}$ hours
$\therefore \quad$ Time taken in covering 7.5 $\mathrm{km}$ downstream $=\frac{3}{4}$ hours
Speed $=\frac{\text { Distance }}{\text { Time }}$
$\therefore \quad$ Rate downstream of the boat
$=\frac{7.5}{\frac{3}{2}}=\left(\frac{7.5 \times 2}{3}\right) \mathrm{kmph}$
$=5 $ $\mathrm{kmph}$
Rate downstream of the boat
$=\frac{7.5 \times 4}{3}=10$ $ \mathrm{kmph}$
BETA
