2019 · Q11
Radha and Hema are neighbours and study in the same school. Both of them use bicycles to go to the school. Radha’s speed is 8 km/hr whereas Hema’s speed is 10 km/hr. Hema takes 9 minutes less than Radha to reach the school. How far is the school from the locality of Radha and Hema?
Elementary MathematicsTime, Speed and Distance
- A5 km
- B5.5 km
- C6 km
- D6.5 km
Explanation
If the school is d km away, d/8 − d/10 = 9/60 hours. So d(1/8 − 1/10) = d/40 = 0.15, giving d = 6 km.