Question

A man travelling at a speed of 20 km/hr, reached his office 10 minutes late. Next day he travelled at a speed of 30 km/hr and he reached his office 10 minutes earlier. The distance between his office and home is :

• A. 30 km
• B. 40 km
• C. 50 km
• D. 20 km

Answer 1

Answer:

D. 20 km

Read Explanation:

When he drives at 20 km/h, it takes (t + 1/6) hours and when at 30 kmph, it takes (t – 1/6) hours. 20 * (t + 1/6) = 30 * (t – 1/6) t = 50 mins=5/6 hrs Distance = 20 * (1) = 20 kms

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