Jason's mom drove at 100 km/h for a 160 km trip. How much longer would the trip have taken if she had driven at 90 km/h? (This is grade 7 math)

Ineed to know the answer to this algebra question.

If rs 900 amounts to rs 1044 in 4 years, what sum will amount to 1368 in 3 1/2 years at the same rate

Rachel is studying the population of a particular bird species in a national park. she observes every 10th bird of that species that she can find in the park. her conclusion is that the birds living in the park who belong to that species generally feed on insects. rachel's sample is . based on the sample she picked, rachel's generalization is