Asked by Anonymous
Solution:if a car traveled 5 km/h.Faster it would take one hour less to travel210 kilometer.What is the speed of car and what time does it take?
Answers
Answered by
drwls
Let V be the actual speed, not the 5 km/h faster speed. Let T be the travel time (in hours) to go 210 km at speed V. You can write two equations.
V*T = 210
(V+5)(T-1) = 210
(V + 5)[(210/V) - 1] = 210
That can be converted to a quadratic equation, but I am going to try some numbers for V.
V = 30 km/h ( it works)
T = 7 hours
V*T = 210
(V+5)(T-1) = 210
(V + 5)[(210/V) - 1] = 210
That can be converted to a quadratic equation, but I am going to try some numbers for V.
V = 30 km/h ( it works)
T = 7 hours
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