Alistair and Jonny cross a lake by swimming and using a one-seat canoe. Each swims at 2 km/hour and paddles the canoe at 7 km/hour. They set off from the same point at the same time, heading straight for the boathouse at the opposite side, with Alistair swimming and Jonny paddling the canoe. After a while Jonny stops paddling, gets out of the canoe and immediately starts swimming. When Alistair reaches the canoe, which has not moved since Jonny started swimming, Alistair climbs in and immediately starts paddling. After 90 minutes they both arrive at the boathouse together. For how long was the canoe stationary?r

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