Question

If truck reduces its speed by 24% then it will take 3 hour more than its usual time to cover distance of 380 km find the its usual speed

Answer 1

since distance is same..vt is same .. now the velocity is 76 percent ( 100-24) ... so ratio of velocity is 100 /76.

therefore ratio of time is 76/ 100.

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.therefore 76/ 100 is equal to x/x+3... x is equal to 76/8 or 9.5 .

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now distance/time is velocity. so velocity is 380/9.5 ..which is 40kmph