Bicycle race route
The bicycle race route rises for two-fifths of its length, descends for three-eighths, and is flat for the rest. If the length of the uphill section is 4 km longer than the length of the downhill section, how long is the race route?
a) 160 km b) 100 km c) 120 km d) 150 km
a) 160 km b) 100 km c) 120 km d) 150 km
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