Rohit takes `4 4/5` minutes to make a complete round of a circular park. How much time will 5 he take to make 15 rounds

A park is 1500 metres long and 750 metres wide. A cyclist has to take four rounds of this park.How much time will he take at the speed of 4.5 km/hr?

Some takes time (pix)/(100) minutes to round a circular park. Then Soma will take times to cross the park along its diameter -

A first order reaction taken 45.4 minutes for 50% completion. How much time will it take for 60% completion ?

Rita travels 3 km in 15 minutes on her bicycle. How much time will she take in travelling 7 km?