in a km race , a beats bby 28 metres or 7 seconds . find a ' s timeoverthe course
clearly , b covers 28 m in 7 seconds . : . b ' s time over the course = ( 278 x 1000 ) sec = 250 seconds . : . a ' s time over the course = ( 250 - 7 - ) sec = 243 sec = 4 min . 3 sec . answer e 4 min 3 sec
subtract(subtract(multiply(divide(7, 28), const_1000), 7), multiply(const_2, const_100))