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How long have you been swimming if you swim 2500 m at 5 km per hour then swim 500 m at 10 km per hour?
1 hr = 60 min
1 km = 1000 m
time = distance/speed
Sum the time taken for each leg of the swim, converting the km and m into the same units - I'll use metres:
→ time = 2500m / 5km/h + 500m / 10km/h
= 2500m / (5 × 1000m/h) + 500m / (10 × 1000m/h)
= 2500m / 5000 m/h + 500m/10000m/h
= 0.5 hr + 0.05 hr
= 0.55 hr
= 0.55 × 60 min
= 33 min
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