a man cycles from A to B a distance of 21 km in 1 hour 40 minutes the road from A is level for 13 km and then it is uphill to B. the man's average speed on level is 15k'/hr find his average uphill speed?
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Distance travelled on level road = 13km
Average Speed on level road = 15 km/hr
Time travelled on level road = Distance/Av. Speed
= 13km / 15(km/hr)
= 0.87 hours = 52 mins
Distance travelled uphill = 8km (21km-13km)
Time travelled uphill = 1 hour 40 mins - 52 mins = 48 mins
Average Speed uphill = Distance travelled / Time taken
8km / (48/60 hrs) = 10 km/hr
Average Speed on level road = 15 km/hr
Time travelled on level road = Distance/Av. Speed
= 13km / 15(km/hr)
= 0.87 hours = 52 mins
Distance travelled uphill = 8km (21km-13km)
Time travelled uphill = 1 hour 40 mins - 52 mins = 48 mins
Average Speed uphill = Distance travelled / Time taken
8km / (48/60 hrs) = 10 km/hr
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