Question

Ashwin has to travel from one point to another point in a certain time. Travelling at a speed of 6kmph he reaches 40 m late and travelling at a speed of 8kmph he reaches 12 m earlier. What is the distance between this two points?

• A. 27 km
• B. 18 km
• C. 5 km
• D. 21 km
• E. None of these

Answer 1

The correct option is D 21 km

$\frac{d}{6}-\frac{40}{60}=\frac{d}{8}+\frac{12}{60}\frac{d}{6}-\frac{d}{8}=\frac{12}{60}-\frac{40}{60}\frac{2d}{48}=\frac{52}{60}D=\frac{52\times 40}{60\times 2}=20.8=21km$