Question

Ramu walks at $3$kms per hour while his brother Somu walks at $4kms$ per hour. They both started to school, which is $2$kms away from their house at $7:00$ A.M. Then, which of these is are correct?

• A. Somu reaches school at $7:20$ AM
• B. Somu reaches school $10$ mins earlier than Ramu
• C. Ramu reaches school at $7:30$ AM
• D. All the above

Answer 1

Answer: (B)

Somu reaches school $10$ mins earlier than Ramu

Ramu $=3kmph$

Somu $=4kmph$

Both starts at $7AM$

Distance $=2km$

Time taken by Ramu $\Rightarrow S=v\times t$

$2=3\times t$

$t=\frac{2}{3}hr=\frac{2}{3}\times 60$

$=40min$

Time taken by Somu $\Rightarrow 2=4\times t$

$t=\frac{1}{2}hr=30min.$

$\therefore$ Somu reaches school $10$ mins earlier than Ramu.