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Phổ biến Word Problems >

Jill leaves a store traveling 7mph. After 8 hours John leaves the store traveling the same direction at 21 mph. How long until John catches up with and passes Jill?

Lời Giải

J i ll l e a v es a s t ore t r a v e l in g 7 m p h . A f t er 8 h o u rs J o hn l e a v es t h e s t ore t r a v e l in g t h e s am e d i rec t i o n a t 21 m p h . Ho w l o n g u n t i l J o hn c a t c h es u p w i t h an d p a sses J i ll ?

Lời Giải

Joh n^{'} s time : 4

Các bước giải pháp

Translate the problem into an equation:

7 (x + 8) = 21 x

Giải

x, 7 (x + 8) = 21 x : x = 4

Joh n^{'} s time : 4

Ví dụ phổ biến

The sum of 3 consecutive integers is 51. What is the second number in this sequence?Two dice are rolled. What is the probability of getting a sum greater than 5 three times a certain number is 46 more then the number itself. find the number Brian is x years old.:Peter is 4 years older than Brian.:Amy is 2 years younger than Brian.:The total of their ages is 26 years.:Work out the value of x the product of a number and 6 less than the number is 72. find the number