a) 10 km
b) 6 km
c) 12 km
d) 15 km
Answer: a
Explanation: By increasing his speed by 25%, he will reduce his time by 20%. (This corresponds to a 6 minutes drop in his time.)
Hence, his time originally must have been 30 minutes.
Required distance = 20 kmph × 0.5 hours = 10 km.
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