# physics 20

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Jack, jill and spot go out for a picnic at the side of the river. jack takes spot for a jog. jack and spot are on the wast bank of the 30m wide river when jill is on the east side. the rivers current is 0.75m/s south.
a) spot jumps into the river and swims straight east at 1.8m/s relitive to the water. once across spot runs 4m/s on the shore to get to jill. How long does to take spot to get to jill?
b)jack dives in the river and aims slightly upstream and swims 2m/s relitive to the water to go straight across. How many seconds does jack beat spot by?

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